Tang 02 alkenes

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Tang 02 alkenes

  1. 1. ALKENES
  2. 2. ALKENES-Characterized by C=C double bond(s)-Classified as unsaturated hydrocarbons-empirical formula = CnH2n (applies when the molecule only has one double bond)  CnH2n, n=4 = C4H8
  3. 3. ALKENESSome IUPAC names of alkenes: ethene propene but-1-ene All alkenes have the suffix “ene”
  4. 4. ALKENESIUPAC naming system: prefix -#- suffix family Number of carbons in the Location longest chain number Ex: but -1-ene
  5. 5. ALKENESIUPAC naming system:Name the following alkenes: but-1-ene but-2-ene
  6. 6. ALKENESIUPAC naming system:Name the following alkenes: methylpropene 2-methylbut-2-ene The double bond has a higher numbering priority than the alkyl and halide substituents
  7. 7. ALKENESIUPAC naming system:Name the following alkenes: cis-but-2-ene trans-but-2-enecis = longest chain forms a U shape Geometric isomerstrans = longest chain forms a Z shape
  8. 8. ALKENESIUPAC naming system:Name the following alkenes:trans-3-methylbut-2-ene cis-hept-3-ene
  9. 9. ALKENESIUPAC naming system:Name the following alkenes:2-methylpenta-2,4-diene hepta-1,3,6-triene When there is more than one double bond, add the letter “a” to the end of the prefix (i.e. buta)
  10. 10. ALKENESIUPAC naming system:Name the following alkenes: 3,4-dimethylcyclohexene 5-methylcyclohexa-1,3-diene
  11. 11. ALKENESIUPAC naming system:Name the following alkene: CH3 H3C CH3 H3C CH3 CH3 1,5-diethyl-2,4-dimthyl-3,6-dipropylcyclohexa-1,3-diene
  12. 12. ALKENESDrawing alkenes:Draw the following alkenes using line diagrams2,3-diethylcyclopentene 3-methyl-4-propylocta-2,4-diene
  13. 13. ALKENES Drawing alkenes: Draw the following alkenes using structural diagrams1,2,3-trimethylcyclohexa-1,3-diene 3-methylpent-1-ene H H H C H H H C HH H H C C H H C C C H H C C H C C H H H H C C H H H H C C H H H
  14. 14. ALKENESProperties:-Are hydrophobic like all hydrocarbons-terminal alkenes (ex. ) have slightly lower boilingpoints than their alkane counterparts, but cis, trans, and cyclicalkenes have slightly higher boiling points.
  15. 15. ALKENESProperties:-cis and trans alkenes have slightly higher boiling points thantheir alkane counterparts-this is due to their increased ability to stack together and formLondon Dispersion Forces (cis generally stacks better and hashigher boiling points) cis trans

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