When benzaldehyde (or any other aromatic aldehyde) is heated with anhydride of an aliphatic acid (containing two $α$ -hydrogen atoms) in presence of its sodium salt, condensation takes place to form an unsaturated carboxylic acid. This reaction is called Perkin reaction.

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When benzaldehyde (or any other aromatic aldehyde) is heated with anhydride of an aliphatic acid (containing two $α$ -hydrogen atoms) in presence of its sodium salt, condensation takes place to form an unsaturated carboxylic acid. This reaction is called Perkin reaction.

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