Question

Write a short nots on Hoffmann bromamide reaction.

Answer 1

In Hoffman method, primary amines are prepared  when amide is treated with bromine in the presence of aqueous or ethanolic solution of sodium hydroxide.

The alkyl or aryl group is migrated from carbonyl carbon of amide to the nitrogen.

The obtained amine has one carbon less than that of amide.

Answer 2

Answer :-

In Hoffmann bromamide degradation reaction, an amide reacts with bromine and aqueous solution of sodium hydroxide which produces primary amine. This a degradation reaction as primary amine in the product has one carbon lesser than primary amide (in the reactant).

Secondary and tertiary amides don’t show Hoffmann bromamide reaction. Only one unit or molecule of bromine is used in the reaction.

Primary amides show this reaction.

For reaction mechanism, refer the attachment.

Remarks :-

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