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what is the action of ammonia on aldehyde and ketone with explanation!?
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The reaction of aldehydes and ketones with ammonia or 1º-amines forms imine derivatives, also known as Schiff bases (compounds having a C=N function). Water is eliminated in the reaction, which is acid-catalyzed and reversible in
the same sense as acetal formation.
The carbon atom has a partial positive charge, and the oxygen atom has a partially negative charge. Aldehydes are usually more reactive toward nucleophilic substitutions than ketones because of both steric and electronic effects.Thus, steric hindrance is less in aldehydes than in ketones.
The reaction begins with nucleophilic addition of ammonia or an amine to the carbonyl group of an aldehyde or a ketone. The imine or enamine derivative formed is subsequently reduced by hydrogen to form the amine product. If the nucleophile is ammonia, a primary amine will be formed in reductive amination.
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