Tang 03 alkynes

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Tang 03 alkynes

  1. 1. ALKYNES
  2. 2. ALKYNES-Characterized by C C triple bond(s)-Classified as unsaturated hydrocarbons-empirical formula = CnH2n-2 (applies when the molecule only has one triple bond)  CnH2n-2, n=5 = C5H8
  3. 3. ALKYNESProperties:-Are hydrophobic like all hydrocarbons-Have higher boiling points than alkanes and alkenes due totheir ability to stack
  4. 4. ALKYNESSome IUPAC names of alkynes: ethyne propyne but-1-yne All alkynes have the suffix “yne”
  5. 5. ALKyNESIUPAC naming system: prefix -#- suffix family Number of carbons in the Location longest chain number Ex: but -1-yne
  6. 6. ALKYNESIUPAC naming system:Name the following alkynes: hex-1-yne hex-3-ene
  7. 7. ALKYNES IUPAC naming system: Name the following alkynes: H3C CH3 CH3 CH3 5 6 1 2H3C H3C 1 2 3 4 9 7 5 3 8 6 4 CH3 CH3 CH3 4-methylhex-2-yne 5-ethyl-4,6,7-trimethylnon-2-yne The triple bond has a higher numbering priority than the alkyl and halide substituents
  8. 8. ALKYNES IUPAC naming system: Name the following alkynes: H C 2 1 2 5 3 3 4 5 6H3C 6 4 2 CH 1 7CH3 CH3 hex-4-en-1-yne 3-ethylhept-1-en-4-yne Alkenes are ordered first in the name, and the “e” ending is dropped. Generally, double bonds and triple bonds have equal numbering priority* (aim to get the lowest numbers).
  9. 9. ALKYNESIUPAC naming system:Name the following alkynes: 5 3 6 4 4 2 2 H2C1 3 5 1 CH 6 hex-1-en-5-yne or hex-5-en-1-yne *Double bonds have higher priority than triple bonds whenever there is ambiguity in their numbers.
  10. 10. ALKYNESIUPAC naming system:Name the following alkynes: 4 5 3 6 2 7 1 8 cyclononyne cyclooct-1-en-4-yne
  11. 11. ALKYNESIUPAC naming system:Name the following alkyne: Cl H3C 2 1 3 9 Cl 4 H3C 8 5 F 7 6 Cl F F3,4,5-trichloro-8,9-diethyl-5,7,7-trifluorocyclononyne
  12. 12. ALKYNES Drawing alkynes: Draw the following alkynes using structural diagrams4,5-dibromohex-2-yne 1,2-dimethylcyclooct-1-en-4-yne H H C H H H H H H H HH C C C H C C C H C C C H H Br Br H H C C H C C H H H C C H
  13. 13. ALKYNESDrawing alkynes:Draw the following alkynes using line diagrams non-2-yne non-1-yne 1 8 6 4 8 6 4 2 3 9 7 5 9 7 3 5 2 1 The triple bond cannot bend, so the bonds adjacent to a triple bond must be straight.

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