Lecture16-notes

Lecture16-notes - .(acetylene , Alkynes

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10/4/09 1 Alkynes are hydrocarbons containing a carbon‐carbon triple bond. The general formula for an alkyne is C n H 2n‐2 . The first member of the alkyne series is ethyne (acetylene): Because of the triple bond, alkynes are more reactive than alkenes. Alkynes Alkynes are molecules containing a triple bond: R R The triple bond consists of one σ bond R R sp ‐hybridized carbon p y R R R p x p y R and two π bonds:
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10/4/09 2 Alkynes The sp ‐hybridization results in a 180 0 CCC‐bond angle Consequently, four atoms are arranged linearly. C C C C H H H H H H 180 0 Alkynes O O O O O O H O O H 3 C H O O H N HCH 3 O H Ene‐diyne part of Neocarzinostatin isolated from Streptomyces carzinostaticus aponeocarzinostatin
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10/4/09 3 Alkynes ichthyothereol O C C C C C C C H H H O C H 3 C Found in Amazon basin frogs and in a number of plants, used by Amazon Indians as arrow poison. Alkynes react with the same reagents as alkenes, but with twice as much reagent, since the double bond left after the first addition is also reactive.
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Lecture16-notes - .(acetylene , Alkynes

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