Rosenmund reduction

The Rosenmund reduction is a chemical reaction that reduces an acid halide to an aldehyde using hydrogen gas over palladium-on-carbon poisoned with barium sulfate.



The catalyst must be poisoned because otherwise the catalyst is too active and will reduce the acid chloride to a primary alcohol.

Diisobutylaluminium hydride (DIBALH) can also reduce acid chlorides to aldehydes.