The Rosenmund reduction utilizes hydrogen gas over a palladium catalyst to convert acyl chlorides into aldehydes. What is the fundamental mechanistic role of adding Barium sulfate () and traces of qui

Question

The Rosenmund reduction utilizes hydrogen gas over a palladium catalyst to convert acyl chlorides into aldehydes. What is the fundamental mechanistic role of adding Barium sulfate ($BaSO_4$) and traces of quinoline or sulfur to the catalyst?

Prashant Kotian · Accepted Answer

Correct answer: B. The untreated Palladium catalyst is so highly active that it would reduce the acyl chloride all the way past the aldehyde stage to a primary alcohol. and quinoline act as "poisons" that deactivate the catalyst just enough so that the reduction strictly stops at the aldehyde stage.

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