Consider the following specific nucleophilic reagents used for addition-elimination reactions: Ammonia, Hydroxylamine, Hydrazine, Phenylhydrazine, Semicarbazide, and 2,4-Dinitrophenylhydrazine. How ma

Question

Consider the following specific nucleophilic reagents used for addition-elimination reactions: Ammonia, Hydroxylamine, Hydrazine, Phenylhydrazine, Semicarbazide, and 2,4-Dinitrophenylhydrazine. How many of these require strict catalysis by a weakly acidic medium to react efficiently with aldehydes and ketones?

Prashant Kotian · Accepted Answer

Correct answer: 6. All the listed compounds are weak nucleophiles belonging to the class of ammonia and its derivatives (). They completely rely on a weakly acidic medium to protonate the carbonyl oxygen, which enhances the electrophilicity of the carbonyl carbon so these weak nucleophiles can attack. Therefore, all 6 require it.

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