Why alc.KOH is used instead of aq.KOH in Carbyleamine reaction

The carbylamone reaction proceeds by formation of several intermediates including dichloro carbene  this reaction  is sensitive to water as there are chances of hydrolysis of the intermediates formed.
Hence Alcoholic KOH is used instead of aqeous KOH.

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It must be noted that the reaction inthe presence ofaq. KOH would undergo nucleophilic addition reaction and may result in the formation of an alcohol or a further condensed product.

If the reaction is carried out in the presence of alc. KOH then it would create conditions for a beta- elimination reaction.

Maybe this would help!

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