Ch8slides - 1 leave two p-orbital unhybridized hybridize...

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Unformatted text preview: 1 leave two p-orbital unhybridized hybridize one s-orbital and one p-orbitals Two sp hybrid orbitals and two unhybridized p-orbital sp Hybridized Orbitals Chapter 8: Alkynes C C triple bonds- acetylene (C 2 H 2 ) 2 Alkyne Nomenclature Naming Alkynes Suffix: -yne Many of the same rules for alkanes apply to alkenes 1. Number the carbon chain from the end of the carbon nearest the triple bond 2. The alkyne position is indicated by the number of the alkyne carbon in the chain 3. Compounds with two triple bonds are referred to as diynes, three triple bonds as triynes, etc Systematic Nomenclature (IUPAC System) Prefix-Parent-Suffix Preparation of Alkynes a. Elimination reactions of 1,2-dihalides R 2 X R 1 R 4 H R 3 KOH R 2 R 1 R 3 R 4 + H OH + K X Recall: R 1 H R 2 H H Br R 1 H Br R 2 Br 2 NaNH 2 R 1 H R 2 Br + H NH 2 + Na Br NaNH 2 R 1 R 2 + H NH 2 + Na Br b. From other alkynes. Section 8.8 - 8.10 cis or trans 1,2-dibromide vinyl bromide alkynes R 1 H R 1 R 2 Terminal Alkyne: triple bond is at the end of the carbon chain Internal Alkyne: triple bond is not at the end of the carbon chain 3 Reactions of Alkynes: Addition of HX- Markovnikov addition Addition of X 2 R C C H HX R C C X H H vinyl halide CH 3 CO 2 H HX CH 3 CO 2 H R C C H H X X H gem- dihalide R...
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This note was uploaded on 03/11/2012 for the course CHEM 220A taught by Professor Sulikowski during the Fall '08 term at Vanderbilt.

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Ch8slides - 1 leave two p-orbital unhybridized hybridize...

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