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AlkynesMarch 4, 2014

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Objectives:

1. Define alkynes

2. Name alkynes using the IUPAC system of nomenclature

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What is an alkyne?

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AlkyneAn unsaturated

hydrocarbon that contains a carbon – carbon triple bond

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AlkyneGeneral Formula:

CnH2n-2

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Naming Alkynes

The key to the IUPAC name of an alkyne is the ending

–yne, which shows the presence of a carbon-carbon

triple bond.

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ExamplesHC CH

Ethyne

CH3C CH Propyne

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Naming Alkynes1. In higher alkynes, number the longest carbon chain that contains the triple bond from the end that gives the lower set of numbers to the triply bonded carbons. Indicate the location of the triple bond by the number of its first carbon atom.

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Naming Alkynes

2. Naming branched alkynes is the same with those of alkenes. The same rules apply.

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Examples

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Examples

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ACTIVITY!

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QUIZ – ¼ sheetName the following:

1.

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2.

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3.

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4.

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5.

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Assignment

Give the importance of alkynes.

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Thank you!!!

Enjoy Chemistry!