Q.14 Write the reaction for the preparation of :
(i) acetaldehyde by Rosenmund reaction.
(ii) benzaldehyde by Gatterman-Koch formylation.
Best answer
Answer: See the two reactions below.
(i) Rosenmund reduction: acetyl chloride is hydrogenated over Pd poisoned with BaSO4.
\(\mathrm{CH_3COCl + H_2 \xrightarrow{Pd\text{-}BaSO_4} CH_3CHO + HCl}\)
(ii) Gattermann-Koch formylation: benzene is treated with CO and HCl in the presence of anhydrous AlCl3 and CuCl.
\(\mathrm{C_6H_6 + CO + HCl \xrightarrow{anhyd.\ AlCl_3,\ CuCl} C_6H_5CHO + HCl}\)
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