Reaction of Alkynes

When alkynes are treated with hot KMnO4, a triple bond is completely broken forming carboxylic acids and aldehydes depending upon the structure of alkyne.

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In an alkyne hydrohalogenation reaction, addition of excess acid yields to a vinyl halide. *

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Halogenation of alkynes can also proceeds through a bridged-ion intermediate, providing cis- products. *

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Hydrohalogenation of alkynes also follows the Markovnikov's Rule which states that hydrogen adds to the carbon with the least number of hydrogen attached to it.

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Hydrohalogenation of alkynes also follows the Markovnikov's Rule which states that hydrogen adds to the carbon with the least number of hydrogen attached to it.

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Lindlar's catalyst, prepared by deactivating (or poisoning) a conventional palladium catalyst by treating it with lead acetate and quinoline, permits alkynes to be converted to alkenes without further reduction to an alkane, hence forms a trans-alkene.

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Ozonolysis of internal alkynes yields to a carboxylic acid.

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Using a cold dilute potassium permanganate, alkynes are oxidized to form carboxylic acids or 1,2-diketones.

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Water can be added across triple bonds in alkynes to yield aldehydes for internal alkynes and ketones for terminal alkynes.

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Halogenation of an alkynes produces a final product of tetrahalide.

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