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  4. Conversion of benzaldehyde to 3-phenyl-prop-2-en-1-oic acid is:

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Q. Conversion of benzaldehyde to $3$-phenyl-prop-$2$-en-$1$-oic acid is:

Jharkhand CECEJharkhand CECE 2005Aldehydes Ketones and Carboxylic Acids

Solution:

(i) Benzaldehyde does not undergo aldol condensation as it does not have $a$-hydrogen atom.
(ii) Perkin condensation
$\underset{\text{benzaldehyde}}{C_6H_5CHO} + \underset{\text{acetic anhydride}}{(CH_3CO)_2O} \xrightarrow[-H_2O, \Delta]{CH_3COONa} $
$\underset{\text{3−phenylprop 2−en−1 oicacid}}{C_6H_5CH = CHCOOH + CH_3COOH}$