1. Aldehydes and ketones are organic compounds that contain a carbonyl group. Their general formulas are RCHO and RCOR' respectively.
2. They undergo several characteristic reactions including oxidation, reduction, addition reactions, condensation reactions, and substitution reactions. Common reactions include hydrate formation, addition of Grignard reagents, and cyanohydrin formation.
3. Due to the polarity of the carbonyl group, aldehydes and ketones exhibit properties between nonpolar alkanes and polar alcohols such as higher boiling points and solubility. They also undergo nucleophilic addition reactions at the carbonyl carbon.
Aldehydes and ketones are organic compounds which incorporate a carbonyl functional group, C=O. The carbon atom of this group has two remaining bonds that may be occupied by hydrogen or alkyl or aryl substituents. If at least one of these substituents is hydrogen, the compound is an aldehyde.
Aldehydes and ketones are organic compounds which incorporate a carbonyl functional group, C=O. The carbon atom of this group has two remaining bonds that may be occupied by hydrogen or alkyl or aryl substituents. If at least one of these substituents is hydrogen, the compound is an aldehyde.
Preparation and reaction of aldehyde and ketone, electromeric effect, aldol condensation, cannizarro reaction, perkin condensation, benzoin condensation, nucleophilic addition reaction and uses of aldehyde and ketone
Preparation, reactions, Acidity, effect of substituents on acidity, structure and uses of carboxylic acid and identification tests for carboxylic acid, amide and ester
In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom: C=O. It is common to several classes of organic compounds, as part of many larger functional groups. A compound containing a carbonyl group is often referred to as a carbonyl compound.
The combination of a carbonyl group and a hydroxyl on the same carbon atom is called a carboxyl group. Compounds containing the carboxyl group are called carboxylic acids. The carboxyl group is one of the most widely occurring functional groups in organic chemistry.
Aromatic Carboxylic acids: Carboxylic acids have an aryl group bound to the carboxyl group is known as aromatic carboxylic acids. The general formula of an aliphatic aromatic carboxylic acid is Ar-COOH.
Acidity of carboxylic acid:
A carboxylic acid may dissociate in water to give a proton and a carboxylate ion. Dissociation of a carboxylic acid involves breaking an O-H bond gives a carboxylate ion with the negative charge spread out equally over two oxygen atoms, compared with just one oxygen atom in an alkoxide ion. The delocalized charge makes the carboxylate ion more stable therefore; dissociation of a carboxylic acid to a carboxylate ion is less endothermic.
Preparation Methods:
1. Oxidation:
The oxidation of aldehyde with oxidizing agents such as CrO3 to forms carboxylic acids containing the same numbers of carbon atoms with a oxidizing agents like chromic acid, chromium trioxide. The silver oxide (Ag2O) in aqueous ammonia solution (Tollen’s reagent) is mild reagent give good yield at room temperature. E.g. Acetaldehyde reacts with CrO3 in aqueous acid to give acetic acid.
2. Grignard reagents (from CO2):
Carboxylic acid can be prepared by the reaction of Grignard reagent (alkyl magnesium halide) with carbon dioxide (CO2) in presence of dry ether. Grignard reagents react with carbon dioxide to forms a magnesium carboxylates which on hydrolysis by dilute HCl produces carboxylic acids.
3. Hydrolysis of nitrile:
The hydrolysis of nitrile or cyanide in presence of dilute acid to forms a carboxylic acid. In this reaction –CN group is converted to a –COOH group.
4. Hydrolysis Reactions:
All the carboxylic acid derivatives can be hydrolyzed into the carboxylic acid in the acidic or basic media; the hydrolysis reaction is fast and occurs in presence of water with no acid or base catalyst.
1. From Ester (Hydrolysis of ester): Ester can be hydrolyzed in either acidic or basic medium to yield carboxylic acid. The ester is heated with an excess of water contains strong acid or base catalyst.
Properties of Carboxylic Acids:
1. Low molecular weights carboxylic acids are colourless liquid at room temperature i.e. lower member ate liquid up to C9 and have characteristic odors whereas higher members are solid.
2. Carboxylic acids are polar organic compound. Low molecular weight carboxylic acids (first four members) are soluble in water whereas solubility in water decrease as molecular weight and chain lengthing increases.
3. Aromatic acids are insoluble in water.
4. Carboxylic acids have higher melting and boiling point due to their capacity to readily form stable hydrogen-bonded dimers.
Preparation and reaction of aldehyde and ketone, electromeric effect, aldol condensation, cannizarro reaction, perkin condensation, benzoin condensation, nucleophilic addition reaction and uses of aldehyde and ketone
Preparation, reactions, Acidity, effect of substituents on acidity, structure and uses of carboxylic acid and identification tests for carboxylic acid, amide and ester
In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom: C=O. It is common to several classes of organic compounds, as part of many larger functional groups. A compound containing a carbonyl group is often referred to as a carbonyl compound.
The combination of a carbonyl group and a hydroxyl on the same carbon atom is called a carboxyl group. Compounds containing the carboxyl group are called carboxylic acids. The carboxyl group is one of the most widely occurring functional groups in organic chemistry.
Aromatic Carboxylic acids: Carboxylic acids have an aryl group bound to the carboxyl group is known as aromatic carboxylic acids. The general formula of an aliphatic aromatic carboxylic acid is Ar-COOH.
Acidity of carboxylic acid:
A carboxylic acid may dissociate in water to give a proton and a carboxylate ion. Dissociation of a carboxylic acid involves breaking an O-H bond gives a carboxylate ion with the negative charge spread out equally over two oxygen atoms, compared with just one oxygen atom in an alkoxide ion. The delocalized charge makes the carboxylate ion more stable therefore; dissociation of a carboxylic acid to a carboxylate ion is less endothermic.
Preparation Methods:
1. Oxidation:
The oxidation of aldehyde with oxidizing agents such as CrO3 to forms carboxylic acids containing the same numbers of carbon atoms with a oxidizing agents like chromic acid, chromium trioxide. The silver oxide (Ag2O) in aqueous ammonia solution (Tollen’s reagent) is mild reagent give good yield at room temperature. E.g. Acetaldehyde reacts with CrO3 in aqueous acid to give acetic acid.
2. Grignard reagents (from CO2):
Carboxylic acid can be prepared by the reaction of Grignard reagent (alkyl magnesium halide) with carbon dioxide (CO2) in presence of dry ether. Grignard reagents react with carbon dioxide to forms a magnesium carboxylates which on hydrolysis by dilute HCl produces carboxylic acids.
3. Hydrolysis of nitrile:
The hydrolysis of nitrile or cyanide in presence of dilute acid to forms a carboxylic acid. In this reaction –CN group is converted to a –COOH group.
4. Hydrolysis Reactions:
All the carboxylic acid derivatives can be hydrolyzed into the carboxylic acid in the acidic or basic media; the hydrolysis reaction is fast and occurs in presence of water with no acid or base catalyst.
1. From Ester (Hydrolysis of ester): Ester can be hydrolyzed in either acidic or basic medium to yield carboxylic acid. The ester is heated with an excess of water contains strong acid or base catalyst.
Properties of Carboxylic Acids:
1. Low molecular weights carboxylic acids are colourless liquid at room temperature i.e. lower member ate liquid up to C9 and have characteristic odors whereas higher members are solid.
2. Carboxylic acids are polar organic compound. Low molecular weight carboxylic acids (first four members) are soluble in water whereas solubility in water decrease as molecular weight and chain lengthing increases.
3. Aromatic acids are insoluble in water.
4. Carboxylic acids have higher melting and boiling point due to their capacity to readily form stable hydrogen-bonded dimers.
Aldehydes and ketones are the carbonyl compounds with general formula CnH2nO. Aldehydes have at least one hydrogen atom bonded to the carbonyl group and other group is either hydrogen or an alkyl or aryl group (i.e. Aldehyde has one alkyl or aryl group and one of the hydrogen bonded to the carbonyl carbon) with characteristics functional group -CHO.
Organic Chemistry: Carbonyl Compounds and Nitrogen CompoundsIndra Yudhipratama
Organic Chemistry: Carbonyl Compounds and Nitrogen Compounds
Discussing nucleophilic addition on carbonyl discussion and reactions on carboxylic acid and its derivates. Also a brief description about amino acids and protein structures
Procedure for test of aldehydes and ketones:
Dissolve the given organic compound in ethanol.
To this solution, add an alcoholic solution of 2,4-dinitrophenyl hydrazine.
Shake the mixture well.
If there is a formation of yellow to orange precipitate then the given compound is an aldehyde or ketone.
Important functional group of organic chemistry alcohol. introduction classification properties preparation and chemical reactions. Alcohols are classified as primary, secondary, or tertiary, based upon the number of carbon atoms connected to the carbon atom that bears the hydroxyl group.
Classification of alcohols: Depending on the number of hydroxyl group present, they are classified into following types.
Monohydric alcohols: Alcohols having only one -OH group is present in the molecule are known monohydric alcohols. Example: Methyl alcohol, Ethyl alcohol etc.,
Dihydric alcohols: Alcohols having two hydroxyl groups in a molecule are known as dihydric alcohols or diols or glycols. Example: 1,2-ethandiol (Glycol).
Trihydric alcohols: Alcohols having three hydroxyl groups are called trihydric alcohols. Example: 1, 2, 3-propantriol (Glycerol).
Alcohols having only one -OH group is present in the molecule are known as monohydric alcohols. Monohydric alcohols are classified depending on the number of carbon atoms which are directly attached to the carbon which contain –OH group are primary (1º), secondary (2º) or tertiary (3º). Depending upon whether the number of alkyl groups bonded to the carbon atom bearing the hydroxyl group is one, two or three, respectively
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...Scintica Instrumentation
Intravital microscopy (IVM) is a powerful tool utilized to study cellular behavior over time and space in vivo. Much of our understanding of cell biology has been accomplished using various in vitro and ex vivo methods; however, these studies do not necessarily reflect the natural dynamics of biological processes. Unlike traditional cell culture or fixed tissue imaging, IVM allows for the ultra-fast high-resolution imaging of cellular processes over time and space and were studied in its natural environment. Real-time visualization of biological processes in the context of an intact organism helps maintain physiological relevance and provide insights into the progression of disease, response to treatments or developmental processes.
In this webinar we give an overview of advanced applications of the IVM system in preclinical research. IVIM technology is a provider of all-in-one intravital microscopy systems and solutions optimized for in vivo imaging of live animal models at sub-micron resolution. The system’s unique features and user-friendly software enables researchers to probe fast dynamic biological processes such as immune cell tracking, cell-cell interaction as well as vascularization and tumor metastasis with exceptional detail. This webinar will also give an overview of IVM being utilized in drug development, offering a view into the intricate interaction between drugs/nanoparticles and tissues in vivo and allows for the evaluation of therapeutic intervention in a variety of tissues and organs. This interdisciplinary collaboration continues to drive the advancements of novel therapeutic strategies.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
Nutraceutical market, scope and growth: Herbal drug technologyLokesh Patil
As consumer awareness of health and wellness rises, the nutraceutical market—which includes goods like functional meals, drinks, and dietary supplements that provide health advantages beyond basic nutrition—is growing significantly. As healthcare expenses rise, the population ages, and people want natural and preventative health solutions more and more, this industry is increasing quickly. Further driving market expansion are product formulation innovations and the use of cutting-edge technology for customized nutrition. With its worldwide reach, the nutraceutical industry is expected to keep growing and provide significant chances for research and investment in a number of categories, including vitamins, minerals, probiotics, and herbal supplements.
The increased availability of biomedical data, particularly in the public domain, offers the opportunity to better understand human health and to develop effective therapeutics for a wide range of unmet medical needs. However, data scientists remain stymied by the fact that data remain hard to find and to productively reuse because data and their metadata i) are wholly inaccessible, ii) are in non-standard or incompatible representations, iii) do not conform to community standards, and iv) have unclear or highly restricted terms and conditions that preclude legitimate reuse. These limitations require a rethink on data can be made machine and AI-ready - the key motivation behind the FAIR Guiding Principles. Concurrently, while recent efforts have explored the use of deep learning to fuse disparate data into predictive models for a wide range of biomedical applications, these models often fail even when the correct answer is already known, and fail to explain individual predictions in terms that data scientists can appreciate. These limitations suggest that new methods to produce practical artificial intelligence are still needed.
In this talk, I will discuss our work in (1) building an integrative knowledge infrastructure to prepare FAIR and "AI-ready" data and services along with (2) neurosymbolic AI methods to improve the quality of predictions and to generate plausible explanations. Attention is given to standards, platforms, and methods to wrangle knowledge into simple, but effective semantic and latent representations, and to make these available into standards-compliant and discoverable interfaces that can be used in model building, validation, and explanation. Our work, and those of others in the field, creates a baseline for building trustworthy and easy to deploy AI models in biomedicine.
Bio
Dr. Michel Dumontier is the Distinguished Professor of Data Science at Maastricht University, founder and executive director of the Institute of Data Science, and co-founder of the FAIR (Findable, Accessible, Interoperable and Reusable) data principles. His research explores socio-technological approaches for responsible discovery science, which includes collaborative multi-modal knowledge graphs, privacy-preserving distributed data mining, and AI methods for drug discovery and personalized medicine. His work is supported through the Dutch National Research Agenda, the Netherlands Organisation for Scientific Research, Horizon Europe, the European Open Science Cloud, the US National Institutes of Health, and a Marie-Curie Innovative Training Network. He is the editor-in-chief for the journal Data Science and is internationally recognized for his contributions in bioinformatics, biomedical informatics, and semantic technologies including ontologies and linked data.
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
3. Naming Of Aldehyde:
•Select the longest continuous carbon chain that contains the C=O group and replace
the ending by the suffix al.
•The CHO group is assigned the number 1 position and takes precedence over other
functional groups that may the present such as –OH, C=C.
4. Common name: listing the alkyl substituents attached to the carbonyl
group, followed by the word ketone.
IUPAC system: replace the ending –e by the suffix –one. The chain is
numbered in such a way as give the lowest number to the C=O group.
Common Dimethyl ketone Methyl phenyl ketone Methyl vinyl ketone Diphenyl ketone
Acetone Acetophenone Benzophenone
IUPAC Propanone Phenyl ethanone 3-Buten-2-one Diphenylmethanone
CH3 C CH3
O
CH3 C C6H5
O
CH3 C CH=CH2
O
H5C6 C
O
C6H5
Naming Of Ketone
5. Because the polarity of the carbonyl group, aldehydes and ketones are
polar compounds.
Dipole-dipole attractions, although important, are not as strong as
interactions due to hydrogen bonding. As a result, the boiling points of
aldehydes and ketones are higher than those of nonpolar alkanes, but
lower than those of alcohols.
The lower aldehydes and ketones are soluble.
C O C
+
O
-
O
C O
C
δ
−
δ
−
δ
+
δ
+
C O H
O
H CO
δ
−
δ
+
δ
+
δ
−
11. 1- Reduction of carbonyl group
a- Addition of metal hydride
CH3
O
H
2 H2 / Pd
CH3
OH
CH3
OH
1) NaBH4
2) H2O
C O C O-M+H C OHH+ M+
H-
H2O
H+
H2O
H+
O
LiAlH4
OAl
H
OH
12. R C
O
H
R CH OH
R'
R C OH
R'
R''
R C R'
O
+ R'MgX
1) Dry ether
2) H2O
+ R''MgX
1) Dry ether
2) H2O
CH3 C
O
H
CH3 CH
OH
C2H5+ C2H5MgX
1) Dry ether
2) H2O
+ CH3MgX
1) Dry ether
2) H2O
O
CH3
OH
b- Addition of Grignard Reagents: Formation of alcohols
13. c- Clemmenson reduction
d- The Wolf-kishner reduction
O
COOH HCl / Zn(Hg) COOH
H
H
COOH
O
NH2NH2
COOH
N-NH2
COOH
NaOH
∆
H
H
14. e- Wittig reaction
C
O
+ CH2=P(C6H5)3
THF
C
O-
CH2
P(C6H5)3
C
O
CH2
P(C6H5)3
C CH2 + (C6H5)3P=O
H
O
+ (Ph)3P=CH C OC2H5
O
OC2H5
O
15. 2- Oxidation reaction
a-
b- Tollenis test
c- Iodoform reaction
R-CHO or Ar-CHO
KMnO4
or K2Cr2O7
RCOOH or ArCOOH
RCOO-
+ 2 Ag(NH3)+
2 + OH-
+ 2 Ag + 4 NH3 + 3 H2ORCHO
C O
CH3
R
+ 3 I2 + 4 NaOH R
O
O
-
Na
+ + CHI3 + 3 NaI
CH3
CH3
O
I2 / NaOH
CH3
COONa
+ CHI3
16. R C OH
R'
CN
R C R'
O
+ HCN
O
H
+ HCN
OH
CN
Cyanohydrin
Benzaldehyde cyanohydrin
O
+ HCN
OH
CN
H2 / Pt
or LiAlH4 and H3O
+
OH
NH2
H3O
+
Heat
OH
COOH
3- Addition of Hydrogen Cyanide: Formation of cynohydrins
17. R C
O
R
2
R C OH
R'O
R
2
+ R'OH
CH3 C
O
H
CH3 CH
OH
OC2H5
+ C2H5OH
H
+ R''OH
H
+ R C OR''
R'O
R
2
R
2
=H:
R
2
=Alkyl
Aldehyde
Ketone
Hemiacetal
Hemiketal
Acetal
Ketal
H
+
C2H5OH
H
+
CH3 CH
H5C2O
OC2H5
Hemiacetal Acetal
CH3 C
O
CH3
CH3 C
OH
OC2H5
CH3
+ C2H5OH
H
+
C2H5OH
H
+
CH3 C
H5C2O
OC2H5
CH3
Hemiketal Ketal
4- Addition of alcohols:
18. C O
NH3
C NH
Imine
NH2OH
Hydroxylamine
C N OH
C N NH2
C N NH
C N NH
O2N
NO2
C N NH C NH2
O
Oxime
NH2 NH2
Hydrazine
Hydrazone
NH2 NH
Phenylhydrazone
Phenylhydrazine
NH2 NH
O2N NO2
2,4
-
Dinitrophenylhydrazone
NH2 NH C NH2
O
Semicarbazide
Semicarbazone
6- Addition of Ammonia and Ammonia Derivatives
19. 7.ALDOL CONDENSATION
Condensation between two molecules of an Aldehyde or a
ketone to form a β-hydroxyl aldehyde or a β-hydroxy ketone is
known as a ALDOL CONDENSATION.
ALDOL CONDENSATION is possible only when the carbonyl
compound contains atleast one α-hydrogen atom.
20. MECHANISM
enolate
ion
An enolate ion is the anion formed when
an alpha hydrogen in the molecule of
an aldehyde or a ketone is removed as a
hydrogen ion.
23. Crossed aldol condensation
In the presence of a strong base, two
different molecules of aldehyde or ketone
combine to form a β-hydroxyaldehyde or a
β-hydroxyketone.
This reaction is called as the aldol
condensation.
24. The enolate ion (carbanion) is the actual
nucleophilic reagent.
The reaction breaks down to the
following:
The α-carbon of the donor attaches itself to
the carbonyl carbon of the acceptor.
25. Step 1: Deprotonation and formation of
nucleophile.
• Step 2: Attack by nucleophile: Formation of alkoxide
ion.
26. Step 3: Hydrolysis and formation of Aldol type product
Step 4: Intramolecular dehydration
27. 8- Cannizzaro reaction
Aldehyde which does not contain α hydrogen undergoes Cannizzaro
reaction.
CHO
+ NaOH (30 %)
∆
+
CH2OH
COO-
Na+
CH
+ OH-
C
O-
OH
O
H
C
C CH2O-
+
OH
O
O
H
C CH2OH
+
O-
O
more stable anion