Illustrated Glossary of Organic Chemistry

Rosenmund reduction: Reduction of an acid chloride to an aldehyde using hydrogen and a poisoned catalyst.

	H2 Pd/BaSO4
Benzoyl chloride An acid chloride		Benzaldehyde An aldehyde

In this Rosenmund reduction, benzoyl chloride (an acid chloride) is reacted with hydrogen and Pd/BaSO₄ (a poisoned catalyst) to produce benzaldehyde (an aldehyde).