Chapter 16, Problem 6PP

Interpretation Introduction

Interpretation:

The nucleophile in the reaction of aldehyde and ketones with ${\text{LiAlH}}_4{\text{ and NaBH}}_4$ is to be identified.

Concept introduction:

Both ${\text{LiAlH}}_4{\text{ and NaBH}}_4$ are reducing agents. They act as a source of four hydride ions. Hydride reacts with the carbonyl group in aldehydes or ketones to give alcohols.

The mechanism for both ${\text{LiAlH}}_4{\text{ and NaBH}}_4$ is the same. Aldehydes are converted to primary alcohols and ketones are converted to secondary alcohols.