Free radical
•
2 likes•597 views
Dr. Neelam from the chemistry department presented on free radicals. There are two types of cleavage - homolytic and heterolytic. Free radicals are generated through photochemical, thermal, and decomposition reactions. They are electron deficient and reactive. The mechanism of halogenation of ethane by free radicals was also discussed, including the initiation, propagation, and termination steps. The document concluded by covering differences between iodination, fluorination, chlorination, and bromination of alkanes.
Report
Share
Report
Share
Download to read offline
Recommended
Electrophilic aromatic substitution reactions
This is Power Point Presentation on Topic "Electrophilic Aromatic Substitution Reactions" as per syllabus of "University of Mumbai" for S.Y. B. Pharmacy (Sem.: IV) students.
Substitution reactions
This document summarizes different types of substitution reactions in aliphatic and aromatic compounds. It describes three main types of substitution reactions: free radical substitution, electrophilic substitution, and nucleophilic substitution. Free radical substitution involves radicals and occurs in non-polar solvents. Electrophilic substitution can be aliphatic or aromatic and involves attack by an electrophile. Nucleophilic substitution involves displacement by a nucleophile and can proceed by SN1, SN2, or addition-elimination mechanisms. The document provides examples and details of the mechanisms and factors that influence each type of substitution reaction.
Carbocations and carbanions
This document discusses organic reaction intermediates, specifically carbocations and carbanions. It defines them as positively or negatively charged carbon-containing ions that are formed during chemical reactions and then react further to form final products. The key features, methods of formation, factors affecting stability, and synthetic applications of carbocations and carbanions are described. Inductive effects, resonance effects, and hyperconjugation influence the stability of these intermediates. Carbocations and carbanions are involved in many common organic reaction types such as eliminations, substitutions, additions, and rearrangements.
Carbene
This document discusses carbenes, which are neutral carbon molecules with two unshared valence electrons. It describes the different types of carbenes, including singlet and triplet carbenes, and their electronic structures and bonding properties. Methods of forming carbenes are presented, such as alpha elimination reactions and decomposition of diazo compounds. The major reactions of carbenes are also summarized, including insertion, addition, and rearrangement reactions. Carbene reactivity depends on whether they are in singlet or triplet states.
Cycloaddition reactions [2+2]
The video lecture for this presentation is available at the following link on YouTube
https://youtu.be/3sxal579RNM
The presenation will be useful for Ug/PG (Chemistry) students
Carbanions
Carbanions are carbon atoms with a negative charge that are formed through various mechanisms. They can be classified based on their formation method such as through heterocyclic cleavage, proton abstraction using a base, decarboxylation, addition of a nucleophile to an alkene, or formation of an organometallic compound. Carbanion stability depends on factors like the electronegativity of the carbon, inductive effects, resonance effects, and attachment to sulfur or phosphorus. Aromatic carbanions and those with electron-withdrawing groups are particularly stable due to resonance delocalization. Carbanions have applications in reactions like the Perkin reaction, Claisen condensation, benzoin condensation,
Dienes
in this slide the whole concept of dienes the topic of organic chemistry is described briefly especially from the course of B.sc.
this would be helpful for chemistry students
it includes method of preparation of dienes
addition of halogen , halogen acids. etc.
effect of temperature on reaction
Oxidation of cyclohexanol or preparation of adipic acid
This document describes the procedure for preparing adipic acid from cyclohexanol via oxidation. Cyclohexanol is oxidized using nitric acid and ammonium metavanadate catalyst at 65-70°C to yield adipic acid crystals. The theoretical and experimental yields and melting point of adipic acid are calculated and measured. Adipic acid is an important industrial dicarboxylic acid used to produce nylon polymers.
Recommended
Electrophilic aromatic substitution reactions
This is Power Point Presentation on Topic "Electrophilic Aromatic Substitution Reactions" as per syllabus of "University of Mumbai" for S.Y. B. Pharmacy (Sem.: IV) students.
Substitution reactions
This document summarizes different types of substitution reactions in aliphatic and aromatic compounds. It describes three main types of substitution reactions: free radical substitution, electrophilic substitution, and nucleophilic substitution. Free radical substitution involves radicals and occurs in non-polar solvents. Electrophilic substitution can be aliphatic or aromatic and involves attack by an electrophile. Nucleophilic substitution involves displacement by a nucleophile and can proceed by SN1, SN2, or addition-elimination mechanisms. The document provides examples and details of the mechanisms and factors that influence each type of substitution reaction.
Carbocations and carbanions
This document discusses organic reaction intermediates, specifically carbocations and carbanions. It defines them as positively or negatively charged carbon-containing ions that are formed during chemical reactions and then react further to form final products. The key features, methods of formation, factors affecting stability, and synthetic applications of carbocations and carbanions are described. Inductive effects, resonance effects, and hyperconjugation influence the stability of these intermediates. Carbocations and carbanions are involved in many common organic reaction types such as eliminations, substitutions, additions, and rearrangements.
Carbene
This document discusses carbenes, which are neutral carbon molecules with two unshared valence electrons. It describes the different types of carbenes, including singlet and triplet carbenes, and their electronic structures and bonding properties. Methods of forming carbenes are presented, such as alpha elimination reactions and decomposition of diazo compounds. The major reactions of carbenes are also summarized, including insertion, addition, and rearrangement reactions. Carbene reactivity depends on whether they are in singlet or triplet states.
Cycloaddition reactions [2+2]
The video lecture for this presentation is available at the following link on YouTube
https://youtu.be/3sxal579RNM
The presenation will be useful for Ug/PG (Chemistry) students
Carbanions
Carbanions are carbon atoms with a negative charge that are formed through various mechanisms. They can be classified based on their formation method such as through heterocyclic cleavage, proton abstraction using a base, decarboxylation, addition of a nucleophile to an alkene, or formation of an organometallic compound. Carbanion stability depends on factors like the electronegativity of the carbon, inductive effects, resonance effects, and attachment to sulfur or phosphorus. Aromatic carbanions and those with electron-withdrawing groups are particularly stable due to resonance delocalization. Carbanions have applications in reactions like the Perkin reaction, Claisen condensation, benzoin condensation,
Dienes
in this slide the whole concept of dienes the topic of organic chemistry is described briefly especially from the course of B.sc.
this would be helpful for chemistry students
it includes method of preparation of dienes
addition of halogen , halogen acids. etc.
effect of temperature on reaction
Oxidation of cyclohexanol or preparation of adipic acid
This document describes the procedure for preparing adipic acid from cyclohexanol via oxidation. Cyclohexanol is oxidized using nitric acid and ammonium metavanadate catalyst at 65-70°C to yield adipic acid crystals. The theoretical and experimental yields and melting point of adipic acid are calculated and measured. Adipic acid is an important industrial dicarboxylic acid used to produce nylon polymers.
Hoffmann reaction
The Hofmann rearrangement involves the reaction of an amide with alkaline hypohalite or bromine in alkali to form an amine with one less carbon atom. Specifically, the reaction involves the bromination of the amide nitrogen followed by extraction of a proton and 1,2-shift of the R group to the electron-deficient nitrogen, forming an isocyanate intermediate that hydrolyzes to the final amine. The reaction proceeds through an intramolecular mechanism and retains stereochemistry if the starting amide contains a chiral center. The Hofmann rearrangement finds applications in synthesizing aliphatic and aromatic amines, aldehydes from unsaturated amides, and anthranilic acid from
Reactions intermediate
This document provides an overview of various carbon-based reaction intermediates including carbocations, carbanions, carbenes, free radicals, nitrenes, and nitrenium ions. It discusses their generation, structure, stability, reactions, and detection methods. Key points include that carbocations are positively charged carbon species that react as electrophiles, while carbanions are negatively charged carbon species that react as nucleophiles. Carbenes contain a carbon with six valence electrons in a triplet or singlet state. Free radicals contain one or more unpaired electrons. Nitrenes and nitrenium ions involve a reactive nitrogen species. Detection methods include NMR, EPR, UV-Vis spectroscopy, and trapping reactions.
Aliphatic nucleophlic substituion- shweta parik
The document discusses various types of aliphatic nucleophilic substitution reactions and their mechanisms. It covers SN2 and SN1 mechanisms in detail, providing evidence that supports each. It also discusses borderline cases where reactions have characteristics of both SN1 and SN2, and other mechanisms like SN1', SNi, SET, and addition-elimination that may occur under different conditions. Specific examples of nucleophilic substitution are discussed at allylic, trigonal, and vinylic carbons that may proceed by different pathways than typical SN1 or SN2 reactions.
Neighboring group participation, mechanism, groups, consequences
Neighboring group participation, mechanism, groups, consequences (FROM ORGANIC CHEMISTRY) by AMIR HASSAN OF GOVT. POST GRADUATE COLLAGE MARDAN, KPK, PAKISTAN.
Ozonolysis
Ozonolysis is the oxidative cleavage of carbon-carbon double bonds using ozone. It involves a three step mechanism: 1) ozone inserts into the double bond to form an unstable primary ozonide, 2) the primary ozonide decomposes to a carbonyl and carbonyl oxide through retro cycloaddition, 3) the carbonyl oxide undergoes cycloaddition again with another carbonyl to form a stable ozonide. The ozonide intermediate can then be worked up using reducing or oxidizing agents to yield different products such as aldehydes, ketones, alcohols, or carboxylic acids.
rearrangement reaction
The document discusses several rearrangement reactions including the pinacol rearrangement, Beckmann rearrangement, Heck reaction, ozonolysis, and Grignard reaction. The pinacol rearrangement involves the acid-catalyzed rearrangement of vicinal diols to ketones or aldehydes. The Beckmann rearrangement converts ketoximes to N-substituted amides. The Heck reaction is a palladium-catalyzed coupling of aryl or alkenyl halides with alkenes. Ozonolysis uses ozone to cleave alkenes and alkynes, replacing the multiple bond with a carbonyl. Grignard reagents are important in organic synthesis.
E1 &E2 mechanism, sandmeyer and benzyne mechanism
The document discusses the Sandmeyer reaction, which is a type of radical-nucleophilic aromatic substitution reaction that replaces an amino group on an aromatic ring with different substituents. During the reaction, the amino group is converted to a diazonium salt that can then be transformed into various functional groups using a catalyst. It also describes the reaction of halobenzenes with potassium amide in liquid ammonia to yield aniline, which proceeds through an elimination-addition mechanism involving the elimination of an alpha hydrogen and addition of an amide anion to form an intermediate benzyne structure.
FREE RADICALS , CARBENES AND NITRENES.pptx
This document discusses free radicals, carbenes, and nitrenes. It defines each type of species, describes their characteristics such as electronic structure and stability. The document outlines different types for each species and methods for their formation and synthetic applications. Free radicals form through bond homolysis and vary in stability based on alkyl substituents. Carbenes are divalent carbon species that exist as singlet or triplet forms with different hybridizations. Nitrenes are analogous to carbenes but with nitrogen and vary in stability and spin state. Examples of formation and trapping methods are provided along with sample synthetic reactions for each reactive intermediate.
Organometallic Chemistry
This document discusses organometallic chemistry and is presented by Dr. Manju Sebastian. It describes the classification of organometallic compounds based on the type of metal-carbon bond formed. The classifications include ionic compounds, compounds with sigma bonds, compounds with pi bonds, and compounds with multicenter bonds. Examples are provided for each classification. Additional topics covered include carbonyl complexes, ferrocene, applications of organometallics as catalysts including the Ziegler-Natta and Wilkinson catalysts.
Molecular Rearrangements of Organic Reactions pps
This PPT is usefull for aspirants of JEE-IIT, CSIR-NET and UPSC exams in CHEMISTRY section. It is also usefull for grduates and Post graduates students of Indian Universities.
Synthesis and reactions of Pyrazine
Pyrazine is a six-membered heterocyclic compound derived from benzene by replacing two CH groups with nitrogen atoms. It occurs naturally in some compounds like pteridine, phenazine, and folic acid. Pyrazine is aromatic and weakly basic due to the electron-withdrawing effect of the second nitrogen atom. It undergoes electrophilic addition and substitution reactions at the nitrogen atoms as well as nucleophilic substitution. Some methods to synthesize pyrazine derivatives involve the reduction and oxidation of alpha-nitroso/nitro/azide ketones, condensation of alpha-diketones with diamines followed by oxidation, and epoxide ring opening with ethylenediam
Electrophilic substitution reaction
This document discusses the molecular orbital diagram of benzene and electrophilic substitution reactions. It describes how benzene has delocalized pi molecular orbitals formed from the unhybridized p orbitals of each carbon atom. Nitration and halogenation are given as examples of electrophilic substitution reactions, where an electrophile such as the nitronium ion or chloronium ion attacks the benzene ring. The mechanisms of these reactions involve the formation of an electrophile, then a sigma complex intermediate, followed by formation of the final substituted product. Friedel-Crafts reactions like alkylation and acylation are also discussed as types of electrophilic substitutions catalyzed by Lewis acids.
Basics of Carboxylic acids
Carboxylic acids contain a carboxyl (-COOH) functional group. They are classified as monocarboxylic, dicarboxylic, or tricarboxylic based on the number of carboxyl groups. Carboxylic acids are named using IUPAC or common names. They are resonance stabilized and can form hydrogen bonds. Carboxylic acids are acidic due to the stability of the conjugate base. They undergo characteristic reactions like forming salts, anhydrides, esters, amides, and undergoing oxidation, reduction, decarboxylation. Common carboxylic acids and their uses include acetic acid, lactic acid, citric acid, benzoic acid, and aspirin.
Organic reaction mechanism
The document discusses different types of substitution reactions including nucleophilic substitution, electrophilic substitution, and free radical substitution. It provides details on the mechanisms, kinetics, stereochemistry and factors affecting the rate of nucleophilic substitution reactions SN1 and SN2. SN1 follows a unimolecular mechanism involving a carbocation intermediate while SN2 follows a bimolecular mechanism with a single concerted transition state. The document also discusses electrophilic aromatic substitution reactions and addition and elimination reactions of alkenes and alkynes.
PHASE TRANSFER CATALYSIS [PTC]
PTC IS THE PHASE TRANSFER CATALYSIS HERE TYPES OF PTC ARE DISCUSSED , THEORIES OF CATALYSIS AND MECHANISM OF PTC, ADVANTAGES OF PTC, APPLICATION OF PTC
Benzoin Condenstation Reaction
The benzoin addition is an addition reaction involving two aldehydes. The reaction generally occurs between aromatic aldehydes or glyoxals. The reaction produces an acyloin. In the classic application benzaldehyde is converted to benzoin
Aromatic Nucleophilic Substitution
This document summarizes aromatic nucleophilic substitution reactions. It discusses the SNAr, SN1, and benzyne mechanisms. For SNAr, a strong withdrawing group is needed for reactivity. SN1 is rare for aromatics. In the benzyne mechanism, elimination of H forms benzyne which then adds the nucleophile, producing either ortho or para substituted products. Radiocarbon labeling is used to identify the products. In summary, the document outlines different aromatic nucleophilic substitution reaction mechanisms and factors affecting their reactivity.
Carboxylic acid
Preparation, reactions, Acidity, effect of substituents on acidity, structure and uses of carboxylic acid and identification tests for carboxylic acid, amide and ester
Carbanion
This document discusses carbanions, which are negatively charged carbon-containing species. It describes the structure of carbanions as sp3 hybridized and tetrahedral. Carbanions are stabilized by several factors, including inductive and resonance effects. The stability increases with increased s-character of the carbon atom and delocalization of the negative charge. Carbanions are nucleophilic and can be formed through deprotonation, decarboxylation, metal reduction, or addition to multiple bonds. They have applications in reactions like aldol condensation, Michael addition, Grignard reagents, and the Perkin reaction.
Hofman rearrangement
Hoffman Rearrangement is used to convert an unsubstituted amide into a primary amine with one carbon atom less than the amide.
Halogen Derivatives Part 2.pptx
The document discusses organic chemistry concepts related to radical reactions. It covers topics like radical formation, halogenation of alkanes, the reaction of radicals with sigma and pi bonds, stereochemistry of halogenation, radical chain reactions, antioxidants, and radical halogenation at allylic carbons. It also discusses chlorofluorocarbons and their role in ozone layer depletion through a radical chain mechanism.
Reaction of synthetic importance
B.phram
Semester .4
Subject : Organic chemistry - III
Use as reference and also usable for examination prearation.
gtu afflitited phramacy college's student may using this ppt.
More Related Content
What's hot
Hoffmann reaction
The Hofmann rearrangement involves the reaction of an amide with alkaline hypohalite or bromine in alkali to form an amine with one less carbon atom. Specifically, the reaction involves the bromination of the amide nitrogen followed by extraction of a proton and 1,2-shift of the R group to the electron-deficient nitrogen, forming an isocyanate intermediate that hydrolyzes to the final amine. The reaction proceeds through an intramolecular mechanism and retains stereochemistry if the starting amide contains a chiral center. The Hofmann rearrangement finds applications in synthesizing aliphatic and aromatic amines, aldehydes from unsaturated amides, and anthranilic acid from
Reactions intermediate
This document provides an overview of various carbon-based reaction intermediates including carbocations, carbanions, carbenes, free radicals, nitrenes, and nitrenium ions. It discusses their generation, structure, stability, reactions, and detection methods. Key points include that carbocations are positively charged carbon species that react as electrophiles, while carbanions are negatively charged carbon species that react as nucleophiles. Carbenes contain a carbon with six valence electrons in a triplet or singlet state. Free radicals contain one or more unpaired electrons. Nitrenes and nitrenium ions involve a reactive nitrogen species. Detection methods include NMR, EPR, UV-Vis spectroscopy, and trapping reactions.
Aliphatic nucleophlic substituion- shweta parik
The document discusses various types of aliphatic nucleophilic substitution reactions and their mechanisms. It covers SN2 and SN1 mechanisms in detail, providing evidence that supports each. It also discusses borderline cases where reactions have characteristics of both SN1 and SN2, and other mechanisms like SN1', SNi, SET, and addition-elimination that may occur under different conditions. Specific examples of nucleophilic substitution are discussed at allylic, trigonal, and vinylic carbons that may proceed by different pathways than typical SN1 or SN2 reactions.
Neighboring group participation, mechanism, groups, consequences
Neighboring group participation, mechanism, groups, consequences (FROM ORGANIC CHEMISTRY) by AMIR HASSAN OF GOVT. POST GRADUATE COLLAGE MARDAN, KPK, PAKISTAN.
Ozonolysis
Ozonolysis is the oxidative cleavage of carbon-carbon double bonds using ozone. It involves a three step mechanism: 1) ozone inserts into the double bond to form an unstable primary ozonide, 2) the primary ozonide decomposes to a carbonyl and carbonyl oxide through retro cycloaddition, 3) the carbonyl oxide undergoes cycloaddition again with another carbonyl to form a stable ozonide. The ozonide intermediate can then be worked up using reducing or oxidizing agents to yield different products such as aldehydes, ketones, alcohols, or carboxylic acids.
rearrangement reaction
The document discusses several rearrangement reactions including the pinacol rearrangement, Beckmann rearrangement, Heck reaction, ozonolysis, and Grignard reaction. The pinacol rearrangement involves the acid-catalyzed rearrangement of vicinal diols to ketones or aldehydes. The Beckmann rearrangement converts ketoximes to N-substituted amides. The Heck reaction is a palladium-catalyzed coupling of aryl or alkenyl halides with alkenes. Ozonolysis uses ozone to cleave alkenes and alkynes, replacing the multiple bond with a carbonyl. Grignard reagents are important in organic synthesis.
E1 &E2 mechanism, sandmeyer and benzyne mechanism
The document discusses the Sandmeyer reaction, which is a type of radical-nucleophilic aromatic substitution reaction that replaces an amino group on an aromatic ring with different substituents. During the reaction, the amino group is converted to a diazonium salt that can then be transformed into various functional groups using a catalyst. It also describes the reaction of halobenzenes with potassium amide in liquid ammonia to yield aniline, which proceeds through an elimination-addition mechanism involving the elimination of an alpha hydrogen and addition of an amide anion to form an intermediate benzyne structure.
FREE RADICALS , CARBENES AND NITRENES.pptx
This document discusses free radicals, carbenes, and nitrenes. It defines each type of species, describes their characteristics such as electronic structure and stability. The document outlines different types for each species and methods for their formation and synthetic applications. Free radicals form through bond homolysis and vary in stability based on alkyl substituents. Carbenes are divalent carbon species that exist as singlet or triplet forms with different hybridizations. Nitrenes are analogous to carbenes but with nitrogen and vary in stability and spin state. Examples of formation and trapping methods are provided along with sample synthetic reactions for each reactive intermediate.
Organometallic Chemistry
This document discusses organometallic chemistry and is presented by Dr. Manju Sebastian. It describes the classification of organometallic compounds based on the type of metal-carbon bond formed. The classifications include ionic compounds, compounds with sigma bonds, compounds with pi bonds, and compounds with multicenter bonds. Examples are provided for each classification. Additional topics covered include carbonyl complexes, ferrocene, applications of organometallics as catalysts including the Ziegler-Natta and Wilkinson catalysts.
Molecular Rearrangements of Organic Reactions pps
This PPT is usefull for aspirants of JEE-IIT, CSIR-NET and UPSC exams in CHEMISTRY section. It is also usefull for grduates and Post graduates students of Indian Universities.
Synthesis and reactions of Pyrazine
Pyrazine is a six-membered heterocyclic compound derived from benzene by replacing two CH groups with nitrogen atoms. It occurs naturally in some compounds like pteridine, phenazine, and folic acid. Pyrazine is aromatic and weakly basic due to the electron-withdrawing effect of the second nitrogen atom. It undergoes electrophilic addition and substitution reactions at the nitrogen atoms as well as nucleophilic substitution. Some methods to synthesize pyrazine derivatives involve the reduction and oxidation of alpha-nitroso/nitro/azide ketones, condensation of alpha-diketones with diamines followed by oxidation, and epoxide ring opening with ethylenediam
Electrophilic substitution reaction
This document discusses the molecular orbital diagram of benzene and electrophilic substitution reactions. It describes how benzene has delocalized pi molecular orbitals formed from the unhybridized p orbitals of each carbon atom. Nitration and halogenation are given as examples of electrophilic substitution reactions, where an electrophile such as the nitronium ion or chloronium ion attacks the benzene ring. The mechanisms of these reactions involve the formation of an electrophile, then a sigma complex intermediate, followed by formation of the final substituted product. Friedel-Crafts reactions like alkylation and acylation are also discussed as types of electrophilic substitutions catalyzed by Lewis acids.
Basics of Carboxylic acids
Carboxylic acids contain a carboxyl (-COOH) functional group. They are classified as monocarboxylic, dicarboxylic, or tricarboxylic based on the number of carboxyl groups. Carboxylic acids are named using IUPAC or common names. They are resonance stabilized and can form hydrogen bonds. Carboxylic acids are acidic due to the stability of the conjugate base. They undergo characteristic reactions like forming salts, anhydrides, esters, amides, and undergoing oxidation, reduction, decarboxylation. Common carboxylic acids and their uses include acetic acid, lactic acid, citric acid, benzoic acid, and aspirin.
Organic reaction mechanism
The document discusses different types of substitution reactions including nucleophilic substitution, electrophilic substitution, and free radical substitution. It provides details on the mechanisms, kinetics, stereochemistry and factors affecting the rate of nucleophilic substitution reactions SN1 and SN2. SN1 follows a unimolecular mechanism involving a carbocation intermediate while SN2 follows a bimolecular mechanism with a single concerted transition state. The document also discusses electrophilic aromatic substitution reactions and addition and elimination reactions of alkenes and alkynes.
PHASE TRANSFER CATALYSIS [PTC]
PTC IS THE PHASE TRANSFER CATALYSIS HERE TYPES OF PTC ARE DISCUSSED , THEORIES OF CATALYSIS AND MECHANISM OF PTC, ADVANTAGES OF PTC, APPLICATION OF PTC
Benzoin Condenstation Reaction
The benzoin addition is an addition reaction involving two aldehydes. The reaction generally occurs between aromatic aldehydes or glyoxals. The reaction produces an acyloin. In the classic application benzaldehyde is converted to benzoin
Aromatic Nucleophilic Substitution
This document summarizes aromatic nucleophilic substitution reactions. It discusses the SNAr, SN1, and benzyne mechanisms. For SNAr, a strong withdrawing group is needed for reactivity. SN1 is rare for aromatics. In the benzyne mechanism, elimination of H forms benzyne which then adds the nucleophile, producing either ortho or para substituted products. Radiocarbon labeling is used to identify the products. In summary, the document outlines different aromatic nucleophilic substitution reaction mechanisms and factors affecting their reactivity.
Carboxylic acid
Preparation, reactions, Acidity, effect of substituents on acidity, structure and uses of carboxylic acid and identification tests for carboxylic acid, amide and ester
Carbanion
This document discusses carbanions, which are negatively charged carbon-containing species. It describes the structure of carbanions as sp3 hybridized and tetrahedral. Carbanions are stabilized by several factors, including inductive and resonance effects. The stability increases with increased s-character of the carbon atom and delocalization of the negative charge. Carbanions are nucleophilic and can be formed through deprotonation, decarboxylation, metal reduction, or addition to multiple bonds. They have applications in reactions like aldol condensation, Michael addition, Grignard reagents, and the Perkin reaction.
Hofman rearrangement
Hoffman Rearrangement is used to convert an unsubstituted amide into a primary amine with one carbon atom less than the amide.
What's hot (20)
Neighboring group participation, mechanism, groups, consequences
Neighboring group participation, mechanism, groups, consequences
Similar to Free radical
Halogen Derivatives Part 2.pptx
The document discusses organic chemistry concepts related to radical reactions. It covers topics like radical formation, halogenation of alkanes, the reaction of radicals with sigma and pi bonds, stereochemistry of halogenation, radical chain reactions, antioxidants, and radical halogenation at allylic carbons. It also discusses chlorofluorocarbons and their role in ozone layer depletion through a radical chain mechanism.
Reaction of synthetic importance
B.phram
Semester .4
Subject : Organic chemistry - III
Use as reference and also usable for examination prearation.
gtu afflitited phramacy college's student may using this ppt.
Free Radical Chemistry
Free radicals are atoms or groups of atoms with unpaired electrons that can participate in chemical reactions. Common examples include hydroxyl (HO·) and methyl (H3C·) radicals. Free radical reactions typically occur by initiation, propagation, and termination steps in a chain reaction mechanism. The stability of free radicals is determined by factors such as conjugation, hyperconjugation, and hybridization. Radicals can be detected using techniques like electron paramagnetic resonance spectroscopy.
namma_kalvi_12th_chemistry_unit_11_ppt_material_em_219536.pptx
The document discusses the classification, nomenclature, preparation, properties and reactions of alcohols. Alcohols can be classified based on the number of hydroxyl groups and the carbon they are attached to. The IUPAC system names alcohols based on the parent chain and hydroxyl position. Alcohols can be prepared from alkyl halides, alkenes, carbonyl compounds and by reduction. They have higher boiling points than other organic compounds due to hydrogen bonding. Primary alcohols undergo SN2 reactions while tertiary undergo SN1. Oxidation of primary alcohols yields aldehydes and secondary yields ketones.
Carbonyl compounds
This document provides information about carbonyl compounds, specifically aldehydes and ketones. It discusses their IUPAC nomenclature, methods of preparation including oxidation of alcohols and oxidative cleavage of alkenes, and physical and chemical properties. The chemical reactions covered include nucleophilic addition, reduction, condensation, and oxidation reactions. Examples of important aldehydes and ketones are also mentioned along with their structures and uses.
Alkanes
Introduction
Hybridization Of alkanes
Halogenations of Alkanes
Chlorination of Methane by Substitution
General Reaction of Alkanes
Redox Reaction and Electrochemical Cell (Reaksi Redoks dan Sel Elektrokimia)
An electrochemical cell converts chemical energy into electrical energy through spontaneous redox reactions. It consists of two half-cells separated by a salt bridge. In the cathode half-cell, reduction occurs as oxidized species gain electrons. In the anode half-cell, oxidation occurs as reduced species lose electrons. Electrons flow through an external circuit from the anode to the cathode. The standard electrode potential of each half-reaction predicts the cell's voltage under standard conditions.
Hydrogenation reaction
This document is a seminar submission on catalytic hydrogenation by S.F. Pimple for their M. Pharm program. It contains an introduction, definitions, types of reduction reactions, and details on catalytic hydrogenation including the mechanism, advantages, limitations, applications, and references. The objective is to study catalytic hydrogenation in detail and understand its mechanism. It discusses heterogeneous and homogeneous catalytic hydrogenation and common catalysts used like palladium, Adams catalyst, and Raney nickel. The mechanism involves hydrogen bonding to the metal catalyst, weakening of the alkene pi bond, and transfer of hydrogen atoms to form the saturated alkane product.
Selected synthetic methods in pharmaceutical chemistry.pptx
Selected synthetic methods in Pharmaceutical Biotechnology.
Reduction reactions
This document discusses reduction reactions and reducing agents. It aims to teach the reader to: 1) exploit differences in reactivity between hydride and neutral reducing agents to achieve chemoselective reductions; 2) use substrate chirality to control syn vs. anti diastereoselectivity in ketone reductions; 3) rationalize reaction outcomes using transition state diagrams; 4) appreciate the versatility of transition metals in reductions; 5) understand the utility of dissolving metal reductions; and 6) use radical chemistry for deoxygenation and halide reduction. It then provides details on various hydride and neutral reducing agents, focusing on their reactivities and applications in selective reductions.
Alcohols phenols
This document discusses the nomenclature, properties and reactions of alcohols, phenols, and ethers. It defines each compound group and provides IUPAC names for examples. Alcohols are formed by replacing hydrogen in hydrocarbons with hydroxyl groups. Phenols have hydroxyl groups attached to aromatic systems. Ethers have an alkoxy or aryloxy group in place of hydrogen. The document outlines common preparation methods for each group and describes physical properties like boiling points. It also explains reactions like dehydration, esterification, and oxidation of alcohols.
Metal based reduction reactions
Metal based reduction reactions- Seminar topic in Vellore institute of technology(VIT), Dept. of Chemistry
11 - Reactions of Alcohols - Wade 7th
This document summarizes reactions of alcohols including oxidation, substitution, reduction, dehydration, and other reactions. It discusses oxidation of primary, secondary, and tertiary alcohols using various reagents like PCC and chromium reagents. It also covers substitution reactions using halides, tosylates, and thionyl chloride. Dehydration to alkenes and ether formation are discussed. Unique reactions of diols like pinacol rearrangement and periodate cleavage are presented. Esterification and phosphate ester synthesis are also summarized.
11 reactionsofalcohols-wade7th-140409022905-phpapp01
This document summarizes reactions of alcohols including oxidation, substitution, reduction, dehydration, and other reactions. It discusses oxidation of primary, secondary, and tertiary alcohols using various reagents like PCC and chromium reagents. It also covers substitution reactions using halides, tosylates, and thionyl chloride. Dehydration to alkenes and ether formation are discussed. Unique reactions of diols like pinacol rearrangement and periodate cleavage are presented. Esterification and phosphate ester synthesis are also summarized.
Chapter 19 aldehydes and ketones
HSSC Second year Chemistry course slides for Federal Board Pakistan, lectures by Dr. Raja Hashim Ali (also available on Youtube as a series of video lectures).
REDUCTION.pptx
This document summarizes various reduction methods. It discusses catalytic hydrogenation using metals like palladium and Adam's catalyst. It also describes heterogeneous and homogeneous catalytic hydrogenation. Metallic hydrides like lithium aluminum hydride and sodium borohydride are introduced as reducing agents. Hydrogen transfer reactions using Meerwein-Ponndorf-Verley reduction are also summarized.
Alkane and alkenes
Preparation and reactions of alkane, alkene, conjugated diene, uses of paraffins, electrophilic addition reaction, free radical addition reaction, markovnikov rule, antimarkovnikov rule, stability of alkenes, conjugated dienes, E1 and E2 reaction and mechanism.
Hydrogenation, catalytic hydrogenation
Hydrogenation- definition, catalytic hydrogenation, homogeneous and heterogeneous catalytic hydrogenation, mechanism of catalytic hydrogenation, advantages and disadvantages of catalytic hydrogenation, applications of catalytic hydrogenation
What are hydrocarbons and it's study material in pdf
Hydrocarbons, the fundamental compounds of organic chemistry, are composed of hydrogen and carbon atoms. The diverse world of hydrocarbons is neatly categorized based on their structure and the type of bonds they contain. In Class 11, students delve into the classification of hydrocarbons, exploring alkanes, alkenes, alkynes, and aromatic compounds.
Similar to Free radical (20)
namma_kalvi_12th_chemistry_unit_11_ppt_material_em_219536.pptx
namma_kalvi_12th_chemistry_unit_11_ppt_material_em_219536.pptx
Redox Reaction and Electrochemical Cell (Reaksi Redoks dan Sel Elektrokimia)
Redox Reaction and Electrochemical Cell (Reaksi Redoks dan Sel Elektrokimia)
Selected synthetic methods in pharmaceutical chemistry.pptx
Selected synthetic methods in pharmaceutical chemistry.pptx
11 reactionsofalcohols-wade7th-140409022905-phpapp01
11 reactionsofalcohols-wade7th-140409022905-phpapp01
What are hydrocarbons and it's study material in pdf
What are hydrocarbons and it's study material in pdf
More from Shri Shankaracharya College, Bhilai,Junwani
Environment Economics &Ethics invisible hand & Malthusian theory
Environment Economics &Ethics invisible hand & Malthusian theoryShri Shankaracharya College, Bhilai,Junwani
The document discusses the relationship between economics, environment, and ethics. It summarizes that we are facing issues today because of ignoring the fundamental relationship between the three. The economy relies on ecosystem services provided by the environment, but the environment is being degraded by waste and emissions. Ethical practices also constitute an unseen force guiding economic behavior.Azadi ka amrut mahotsav, Mahilayon ka yogdan swatantrata Sangram mein
Azadi ka amrut mahotsav, Mahilayon ka yogdan swatantrata Sangram meinShri Shankaracharya College, Bhilai,Junwani
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive function. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms for those who already suffer from conditions like anxiety and depression.B.ed 1,scientific temper
Scientific temper and attitude refer to traits like critical thinking, objectivity, open-mindedness, and respect for evidence. Developing a scientific attitude in students is the aim of science teaching. Some key aspects of scientific attitude are questioning beliefs, reasoning logically, honestly reporting observations, and accepting ideas that are supported by evidence. Fostering skills like curiosity, perseverance, and skepticism in students can help cultivate their scientific temper.
Aims and objectives of bio. sci. 14 9-20
This document discusses the aims and objectives of teaching biological science. It begins by defining biological science as the study of life and living organisms. It then lists several objectives of teaching biological science, including developing students' scientific outlook, curiosity about their surroundings, and respect for nature. The document also discusses the values of teaching biological science, which include encouraging curiosity and knowledge, and keeping an open mind. It emphasizes that teaching biological science should help students become responsible democratic citizens and appreciate diverse perspectives. Overall, the document provides an overview of the goals and importance of teaching biological science.
Ict application in bio.sc.24 9
This presentation discusses using information and communication technologies (ICT) applications in biology learning. It introduces the topic, noting the presenter and institution. The document provides references on the advantages and limitations of ICT in education, using ICT to integrate science teaching and learning, and the impact of ICT in education.
Runges kutta method
B.Sc. III mathematics numerical analysis paper - III
Shri shankaracharya Mahavidyalaya junwani bhilai.
Isolation & preservation of culture of microorganism
The term isolation refers to the separation of a strain from a natural, mixed population of living microbes, as present in the environment. It becomes necessary to maintain the viability and purity of the microorganism by keeping the pure culture free from contamination.
Basics concept of physical chemistry
1) The document discusses oxidation-reduction (redox) reactions and concepts related to solution concentrations. It defines oxidizing and reducing agents and gives examples of each.
2) A redox reaction involves the simultaneous oxidation and reduction of reactants. In redox reactions, the total increase in oxidation number equals the total decrease.
3) Disproportionation reactions involve the same element in a compound being both oxidized and reduced. The reverse is called a comproportionation reaction.
indifference curve
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise boosts blood flow, releases endorphins, and promotes changes in the brain which help enhance one's emotional well-being and mental clarity.
Equilibrium
The document discusses the concept of equilibrium in economics. It defines equilibrium as a state of balance where opposing forces neutralize each other. In microeconomics, market equilibrium occurs when supply equals demand. In macroeconomics, equilibrium is reached when aggregate demand equals aggregate supply. The document provides examples of economic disequilibrium and equilibrium, and examines how prices adjust via demand and supply mechanisms to reach equilibrium. Key terms in Hindi are also defined.
Crystal field theory
This document summarizes Crystal Field Theory, which considers the electrostatic interactions between metal ions and ligands. It describes ligands and metal ions as point charges that can have attractive or repulsive forces. This causes the d orbitals of the metal ion to split into two sets depending on if the field created by the ligands is weak or strong. The theory explains color in coordination compounds as being caused by d-d electron transitions under the influence of ligands. However, it has limitations like not accounting for other metal orbitals or the partial covalent nature of metal-ligand bonds.
Utility
Dr. Laxmi Verma teaches Microeconomics at the BA-1 level and her topic is on utility in Unit 1 of the course. She teaches at Shri Shankracharya Mahavidyalya in Junwani.
New economic reform
Dr. Laxmi Verma is teaching a class of B.A-1 students. The subject is Indian Economy and the topic being covered is New Economic Reform. The document provides basic context about an economics lecture being given to undergraduate students on recent reforms in the Indian economy.
Iso product Curve
An iso-product curve shows the different combinations of two factors of production, such as labor and capital, that result in the same level of output. It is represented graphically, with the two factors on the x and y axes and points of equal output connected to form an iso-product curve. Key properties are that iso-product curves slope downward to the right, are convex to the origin, and do not intersect, as each curve represents a different output level. Higher iso-product curves correspond to higher output levels. Iso-product curves allow producers to identify input combinations that achieve maximum output efficiently.
Demand theory
This document discusses demand theory and the relationship between supply and demand. It covers the following key points:
1) Demand theory explains how consumer demand for goods and services relates to their prices in the market. It forms the basis for the demand curve, which shows that as price increases, demand decreases.
2) Demand depends on the utility of goods in satisfying wants and needs as well as a consumer's ability to pay. Supply and demand determine market prices and reach equilibrium when supply equals demand.
3) The demand curve has a negative slope, showing an inverse relationship between price and quantity demanded. A change in non-price factors like income can shift the demand curve. The law of supply and
Land reform
Land reform in India has involved abolishing intermediaries like rent collectors and establishing ceilings on land ownership to redistribute surplus land to the landless. The goals were to remove impediments to agricultural production from the previous feudal system and eliminate exploitation. Key reforms included abolishing rent collectors, regulating tenancy, imposing landholding ceilings, consolidating fragmented holdings, and promoting cooperative farming. Impacts included reducing disparities, giving ex-landlords other work, increasing revenue, and empowering small farmers and laborers. Land reform aimed to promote social justice and economic growth through a more equitable distribution of agricultural land.
Isomerism
This document discusses different types of structural isomerism that can occur in coordination compounds. It defines structural isomerism as compounds having the same molecular formula but different physical and chemical properties due to different structures or orientations. The types of structural isomerism discussed include ionization isomerism, solvate/hydrate isomerism, linkage isomerism, coordination isomerism, ligand isomerism, polymerization isomerism, geometrical isomerism (cis/trans), and optical isomerism. Examples are provided to illustrate each type of isomerism.
More from Shri Shankaracharya College, Bhilai,Junwani (20)
Environment Economics &Ethics invisible hand & Malthusian theory
Environment Economics &Ethics invisible hand & Malthusian theory
Azadi ka amrut mahotsav, Mahilayon ka yogdan swatantrata Sangram mein
Azadi ka amrut mahotsav, Mahilayon ka yogdan swatantrata Sangram mein
Isolation & preservation of culture of microorganism
Isolation & preservation of culture of microorganism
Recently uploaded
Immersive Learning That Works: Research Grounding and Paths Forward
We will metaverse into the essence of immersive learning, into its three dimensions and conceptual models. This approach encompasses elements from teaching methodologies to social involvement, through organizational concerns and technologies. Challenging the perception of learning as knowledge transfer, we introduce a 'Uses, Practices & Strategies' model operationalized by the 'Immersive Learning Brain' and ‘Immersion Cube’ frameworks. This approach offers a comprehensive guide through the intricacies of immersive educational experiences and spotlighting research frontiers, along the immersion dimensions of system, narrative, and agency. Our discourse extends to stakeholders beyond the academic sphere, addressing the interests of technologists, instructional designers, and policymakers. We span various contexts, from formal education to organizational transformation to the new horizon of an AI-pervasive society. This keynote aims to unite the iLRN community in a collaborative journey towards a future where immersive learning research and practice coalesce, paving the way for innovative educational research and practice landscapes.
ESR spectroscopy in liquid food and beverages.pptx
With increasing population, people need to rely on packaged food stuffs. Packaging of food materials requires the preservation of food. There are various methods for the treatment of food to preserve them and irradiation treatment of food is one of them. It is the most common and the most harmless method for the food preservation as it does not alter the necessary micronutrients of food materials. Although irradiated food doesn’t cause any harm to the human health but still the quality assessment of food is required to provide consumers with necessary information about the food. ESR spectroscopy is the most sophisticated way to investigate the quality of the food and the free radicals induced during the processing of the food. ESR spin trapping technique is useful for the detection of highly unstable radicals in the food. The antioxidant capability of liquid food and beverages in mainly performed by spin trapping technique.
Equivariant neural networks and representation theory
Or: Beyond linear.
Abstract: Equivariant neural networks are neural networks that incorporate symmetries. The nonlinear activation functions in these networks result in interesting nonlinear equivariant maps between simple representations, and motivate the key player of this talk: piecewise linear representation theory.
Disclaimer: No one is perfect, so please mind that there might be mistakes and typos.
dtubbenhauer@gmail.com
Corrected slides: dtubbenhauer.com/talks.html
Sharlene Leurig - Enabling Onsite Water Use with Net Zero Water
Sharlene Leurig - Enabling Onsite Water Use with Net Zero WaterTexas Alliance of Groundwater Districts
Presented at June 6-7 Texas Alliance of Groundwater Districts Business Meeting快速办理(UAM毕业证书)马德里自治大学毕业证学位证一模一样
学校原件一模一样【微信：741003700 】《(UAM毕业证书)马德里自治大学毕业证学位证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Applied Science: Thermodynamics, Laws & Methodology.pdf
When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
(June 12, 2024) Webinar: Development of PET theranostics targeting the molecu...
(June 12, 2024) Webinar: Development of PET theranostics targeting the molecu...Scintica Instrumentation
Targeting Hsp90 and its pathogen Orthologs with Tethered Inhibitors as a Diagnostic and Therapeutic Strategy for cancer and infectious diseases with Dr. Timothy Haystead.ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...
ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...Advanced-Concepts-Team
Presentation in the Science Coffee of the Advanced Concepts Team of the European Space Agency on the 07.06.2024.
Speaker: Diego Blas (IFAE/ICREA)
Title: Gravitational wave detection with orbital motion of Moon and artificial
Abstract:
In this talk I will describe some recent ideas to find gravitational waves from supermassive black holes or of primordial origin by studying their secular effect on the orbital motion of the Moon or satellites that are laser ranged.Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Current descriptions of immersive learning cases are often difficult or impossible to compare. This is due to a myriad of different options on what details to include, which aspects are relevant, and on the descriptive approaches employed. Also, these aspects often combine very specific details with more general guidelines or indicate intents and rationales without clarifying their implementation. In this paper we provide a method to describe immersive learning cases that is structured to enable comparisons, yet flexible enough to allow researchers and practitioners to decide which aspects to include. This method leverages a taxonomy that classifies educational aspects at three levels (uses, practices, and strategies) and then utilizes two frameworks, the Immersive Learning Brain and the Immersion Cube, to enable a structured description and interpretation of immersive learning cases. The method is then demonstrated on a published immersive learning case on training for wind turbine maintenance using virtual reality. Applying the method results in a structured artifact, the Immersive Learning Case Sheet, that tags the case with its proximal uses, practices, and strategies, and refines the free text case description to ensure that matching details are included. This contribution is thus a case description method in support of future comparative research of immersive learning cases. We then discuss how the resulting description and interpretation can be leveraged to change immersion learning cases, by enriching them (considering low-effort changes or additions) or innovating (exploring more challenging avenues of transformation). The method holds significant promise to support better-grounded research in immersive learning.
The debris of the ‘last major merger’ is dynamically young
The Milky Way’s (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the
‘last major merger.’ Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor
collided with the MW proto-disc 8–11 Gyr ago, and the Virgo Radial Merger (VRM), where the progenitor collided with the
MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
Compexometric titration/Chelatorphy titration/chelating titration
Classification
Metal ion ion indicators
Masking and demasking reagents
Estimation of Magnisium sulphate
Calcium gluconate
Complexometric Titration/ chelatometry titration/chelating titration, introduction, Types-
1.Direct Titration
2.Back Titration
3.Replacement Titration
4.Indirect Titration
Masking agent, Demasking agents
formation of complex
comparition between masking and demasking agents,
Indicators/Metal ion indicators/ Metallochromic indicators/pM indicators,
Visual Technique,PM indicators (metallochromic), Indicators of pH, Redox Indicators
Instrumental Techniques-Photometry
Potentiometry
Miscellaneous methods.
Complex titration with EDTA.
20240520 Planning a Circuit Simulator in JavaScript.pptx
Evaporation step counter work. I have done a physical experiment.
(Work in progress.)
The cost of acquiring information by natural selection
This is a short talk that I gave at the Banff International Research Station workshop on Modeling and Theory in Population Biology. The idea is to try to understand how the burden of natural selection relates to the amount of information that selection puts into the genome.
It's based on the first part of this research paper:
The cost of information acquisition by natural selection
Ryan Seamus McGee, Olivia Kosterlitz, Artem Kaznatcheev, Benjamin Kerr, Carl T. Bergstrom
bioRxiv 2022.07.02.498577; doi: https://doi.org/10.1101/2022.07.02.498577
在线办理(salfor毕业证书)索尔福德大学毕业证毕业完成信一模一样
学校原件一模一样【微信：741003700 】《(salfor毕业证书)索尔福德大学毕业证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Pests of Storage_Identification_Dr.UPR.pdf
InIndia-post-harvestlosses-unscientificstorage,insects,rodents,micro-organismsetc.,accountforabout10percentoftotalfoodgrains
Graininfestation
Directdamage
Indirectly
•theexuviae,skin,deadinsects
•theirexcretawhichmakefoodunfitforhumanconsumption
About600speciesofinsectshavebeenassociatedwithstoredgrainproducts
100speciesofinsectpestsofstoredproductscauseeconomiclosses
Mending Clothing to Support Sustainable Fashion_CIMaR 2024.pdf
Ozturkcan, S., Berndt, A., & Angelakis, A. (2024). Mending clothing to support sustainable fashion. Presented at the 31st Annual Conference by the Consortium for International Marketing Research (CIMaR), 10-13 Jun 2024, University of Gävle, Sweden.
Recently uploaded (20)
Immersive Learning That Works: Research Grounding and Paths Forward
Immersive Learning That Works: Research Grounding and Paths Forward
ESR spectroscopy in liquid food and beverages.pptx
ESR spectroscopy in liquid food and beverages.pptx
Basics of crystallography, crystal systems, classes and different forms
Basics of crystallography, crystal systems, classes and different forms
Equivariant neural networks and representation theory
Equivariant neural networks and representation theory
Sharlene Leurig - Enabling Onsite Water Use with Net Zero Water
Sharlene Leurig - Enabling Onsite Water Use with Net Zero Water
Applied Science: Thermodynamics, Laws & Methodology.pdf
Applied Science: Thermodynamics, Laws & Methodology.pdf
aziz sancar nobel prize winner: from mardin to nobel
aziz sancar nobel prize winner: from mardin to nobel
(June 12, 2024) Webinar: Development of PET theranostics targeting the molecu...
(June 12, 2024) Webinar: Development of PET theranostics targeting the molecu...
ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...
ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
The debris of the ‘last major merger’ is dynamically young
The debris of the ‘last major merger’ is dynamically young
Compexometric titration/Chelatorphy titration/chelating titration
Compexometric titration/Chelatorphy titration/chelating titration
20240520 Planning a Circuit Simulator in JavaScript.pptx
20240520 Planning a Circuit Simulator in JavaScript.pptx
The cost of acquiring information by natural selection
The cost of acquiring information by natural selection
Mending Clothing to Support Sustainable Fashion_CIMaR 2024.pdf
Mending Clothing to Support Sustainable Fashion_CIMaR 2024.pdf
Free radical
- 1. Presented by Dr. Neelam Department of chemistry
- 2. Type of cleavage Features of free radicals The various ways by which free radicals may be generated Mechanism of free radical Halogenation of Ethane CONTENTS Homolytic cleavage Heterolytic cleavage
- 3. Type of cleavage Heterolytic cleavage Homolytic cleavage X-Y or X:Y X+ + Y- X2 or X-X or X:X X. + .X Free radicalCation anion
- 4. Features of free radicals • A free radical has the following characteristic feature: • Free radicals are electron deficient species. • They are usually uncharged. • They contain odd number of electrons. • The carbon is sp2 hybridized. • In methyl radical or other alkyl radicals, the radical centre is trivalent and trigonally hybridized. • It has planar structure. • Extremely reactive species. • Not a lewis acid.
- 5. The various ways by which free radicals may be generated are Photochemical cleavage Thermal cleavage Decomposition reaction
- 6. PHOTOCHEMICAL CLEAVAGE The energy of light of 600 to 300 nm is 48 to 96 kcal/mol, which is of the order of magnitude of covalent bond energies. Certain molecules undergo homolytic fission in the presence of light of that particular wavelength. For example, the photochemical cleavage of chlorine molecule results into the formation of chlorine free radicals.
- 7. THERMAL CLEAVAGE Free radicals may be generated by thermal cleavage. In the gaseous phase some molecules break down at high temperature. When the molecule contains bonds with 20 to 40 kcal/mol of energy, cleavage can be caused in the liquid phase. For example, the thermal cleavage of azo compounds yields free radical. Azobisisobutyronitrile (AIBN)
- 8. DECOMPOSITION REACTION At times a radical molecule may undergo decomposition to form another free radical. For example, decomposition of benzoyl peroxide radical gives phenyl radical and carbondioxide.
- 9. Initiation Step light energy breaks the x-x bond giving two separate halide radicals (X.). X-X 2X. hν
- 10. Propagation Steps: Each X. formed in Step 1 has the ability to abstract (remove) an H from ethane. We show this in Step 2 where X. removes an H along with one of the electrons in the C-H bond. H- X forms in Step 2 and leaves behind a reactive molecular fragment (CH3- CH2 .) called an ethyl radical. X. + CH3-CH3 HX + CH3-CH2 .
- 11. Chain termination step • The ethyl radical like most alkyl radicals, is very reactive because of its unshared electron. Alkyl radicals rapidly react with other molecules or other radicals that provide another electron to form a chemical bond. During ethane halogenation, the ethyl radical reacts primarily with molecular halide radical to form a C-X bond. X. + X. X2 X. + CH3-CH2 . CH3-CH2X
- 12. Halogenation of Alkanes : X2/hv IODINATION • Highly reversible. R-H R-I + H-I The yield of R-I is very-very poor in Iodination. Reason : • Least reactive I. • Reversible & equation is reached • It is Endothermic process • H-I produced is a strong reducing agent, it reduced to R-I formed into alkane. I2/hυ
- 13. FLUORINATION • Reagent F2/hυ. • It is highly exothermic process • F . reactivity is extremely high • All possible products get formed & they can be fractional distillation • Chain breaking is also observed R-CH2-CH3 R-CH2-CH2F + R-CFH-CH3 + R-CH2-F + CH3F + R-F + CH3-CH2F • Fluorination is not a good method to get alkyl fluoride • To avoid the chain breaking process some N2 gas is introduced (C-C bond breaking not allowed) R − CH2 − CH3 F2/hυ N2 → R-CFH-CH3 + R-CH2-CH2-F F2/hυ
- 14. CHLORINATION • Reagent Cl2/hυ. • It is also exothermic process • All possible products get formed in sufficient quantity & they can be separated by fractional distillation • Chain breaking is not observed • Probability factor is defined for Cl2/hυ • I˚ : II˚ : III˚ = 1 : 3.8 : 4.5 • Chlorination does not support radical stability, but it can be supports radical stability only if it is stabilized by resonence. CH3-CH2-CH3 CH3-CH2-CH2-Cl + CH3-CClH-CH3 CH3-CH2-CH2-CH3 CH3-CH2-CH2-CH2-Cl + CH3-CClH-CH2-CH3 Cl2/hυ Cl2/hυ
- 15. BROMINATION • Reagent Br2/hυ. • It is also exothermic process. • All products cannot be separated by fractional distillation. • Chain breaking is not observed. • Probability factor is defined for Br2/hυ I˚ : II˚ : III˚ = 1 : 82 : 1600 CH3-CH2-CH2-CH3 CH3-CH2-CH2-CH2-Br + CH3-CHBr-CH2-CH3 Br2/hυ
- 16. 16