What is Clemmensen Reduction?
The Clemmensen reduction is a reaction that is used to reduce aldehydes or ketones to alkanes using hydrochloric acid and zinc amalgam. The Clemmensen reduction is named after a Danish chemist, Erik Christian Clemmensen.
This reaction is particularly effective in aryl-alkyl ketones reduction formed in Friedel-Crafts acylation. The reaction is more effective in reduction of cyclic ketones or aliphatic and zinc metal.
Mechanism of Clemmensen Reduction Reaction:
The mechanism of this reaction is not completely understood, but there are two proposals;
Carbanionic mechanism:
The carbanionic mechanism of reaction shows that the zinc attacks directly to the protonated carbon.
Carbenoid mechanism:
While the carbenoid mechanism is a radical process and reduces the happenings on zinc metal surface. The reduction takes place at the surface of the zinc catalyst. In this reaction, alcohols are not postulated as intermediates, because subjection of the corresponding alcohols to these same reaction conditions does not lead to alkanes.
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