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Reduction of aldehydes and ketones
Concepts tested here
- Clemmensen reduction
All Questions
2011 AIPMT-PRE 1 question
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Clemmensen reduction of a ketone is carried out in the presence of which of the following?In the Clemmensen reduction, the carbonyl group of an aldehyde or ketone is reduced to a methylene ($-CH_2-$) group.
The reagent is zinc amalgam and concentrated hydrochloric acid: $>C=O \xrightarrow{Zn-Hg/HCl} >CH_2 + H_2O$
Hydrazine followed by KOH in ethylene glycol is the Wolff–Kishner reduction.
$H_2$/Pt and $LiAlH_4$ reduce a ketone only to a secondary alcohol.
Hence Clemmensen reduction is carried out with Zn-Hg and HCl.