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Organic Chemistry

Part3 : Alkynes and Reaction of Alkynes. Organic Chemistry. Alkynes. -Contain carbon-carbon triple bonds -sp-Hybridization -Unsaturated hydrocarbons -C n H 2n-2. IUPAC names. -Alkynes name are similar to that for alkanes. …………..ane …………..yne. Physical Properties of Alkynes. C2-C4 GAS

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Organic Chemistry

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  1. Part3 : Alkynes and Reaction of Alkynes Organic Chemistry

  2. Alkynes -Contain carbon-carbon triple bonds -sp-Hybridization -Unsaturated hydrocarbons -CnH2n-2

  3. IUPAC names -Alkynes name are similar to that for alkanes. …………..ane …………..yne

  4. Physical Properties of Alkynes • C2-C4 GAS • C5-C17 LIQUID •  C18 SOLID mp. bp. 2. Ethyne C2H2 80.8 -84.0 Propyne C3H4 101.5 -23.2 Butyne C4H6 125.7 8.1

  5. 1 2 Why ??? Why ??? bp Cis-isomer  trans-isomer

  6. Isomers • Same formula • Different structure • Different molecule with different properties – must have a different name! Isomersof C4H6

  7. Isomersof C5H8

  8. Reaction of Alkyne 1. Combustion reaction 2. Additionreaction -Hydrogenation reaction (H2) Ni, Pd, Pt cat. -Halogenation reaction (X2 / CCl4 )

  9. -Hydrohalogenation reaction (HBr) -Hydration reaction (H2O) Condition……………….

  10. 3. Oxidation reaction

  11. Aromatic Compound • The structure must be cyclic, containingsome number of conjugated pi bond. • HUCKEL’ s rule (4n+2; n=0,1, 2,3,4…) • aromatic system 2, 6, 10, 14…)

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