Chemical Science Revision Notes on Wolff-Kishner Reduction - Download PDF!

Study Notes On Wolff-Kishner Reduction

The reaction involves the reduction of the carbonyl group of aldehyde and ketones to methylene groups (or, alkanes). This is a base catalysed reaction.

In this reaction, condensation of a carbonyl compound with hydrazine occurs to form a hydrazone; and when treated with base, it induces the reduction of carbon along with oxidation of hydrazine to gaseous nitrogen and yields corresponding alkane.

General Reaction - 

Reaction Mechanism -

Or,

the mechanism of Wolff Kishner reduction can also be represented as -

Example -

Notes-

1. This reaction is very specific for the reduction of a carbonyl group. Another functional group present in reactants remains intact.
2. Unlike Clemmensen reduction, Wolff-Kishner does not fail with acid-sensitive compounds or high molecular weight compounds.
3. Wolff-Kishner reduction can also be used for the synthesis of long-chain alkyl groups in aromatic rings.

Short Notes on Wolff-Kishner Reduction - Download PDF Now

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