REDUCTION OF CARBONYLS

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Introduction

This page focuses on mechanisms involving the reduction of carbonyls.

Mechanisms

Ketones

The reaction of a ketone with sodium borohydride (NaBH4)

The reaction of a ketone with lithium aluminum hydride (LAH or LiAlH4)

The reaction of a ketone with ethyl Grignard

Esters

Sodium borohydride (NaBH4) is not strong enough to reduce esters and carboxylic acids, so lithium aluminum hydride (LAH or LiAlH4) must be used. Grignard reagents may also be used.

The reaction of an ester with two equivalents of LAH

The reaction of an ester with excess ethyl Grignard