Question

The reagent used in Rosenmund reduction is:

• A. $LiAl{H}_4$
• B. $NaB{H}_4$
• C. $H_2,Pd-BaS{O}_4$
• D. Zinc amalgam and conc. $HCl$

Answer 1

The correct option is C $H_2,Pd-BaS{O}_4$

Acyl chloride/acid chloride undergoes hydrogenation in the presence of a reagent such as $Pd-BaS{O}_4$ to form aldehydes. Aldehyde formation with this process is possible after the partial poisoning of the reaction by the addition of compounds $BaS{O}_4$ or quinoline. This is an important step for the formation of aldehydes. This is also known as Rosenmund reaction.