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  4. What is the name of the following reaction? PhCHO +( CH 3 CO )2 O xrightarrow Na ( OAc )2PhCH = CHCO 2 H

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Q. What is the name of the following reaction?
$PhCHO +\left( CH _{3} CO \right)_{2} O \xrightarrow{ Na ( OAc )_{2}}PhCH = CHCO _{2} H$

AIIMSAIIMS 2017Aldehydes Ketones and Carboxylic Acids

Solution:

The name of the following reaction
$PhCHO +\left( CH _{3} CO \right)_{2} O \xrightarrow{ Na ( OAc )_{2}}PhCH = CHCOOH$ is Perkin reaction.
The product is cinnamic acid, an $\alpha, \beta$-unsaturated aromatic acid.
It is obtained by the aldol condensation of benzaldehyde and acetic anhydride,
in the presence of sodium acetate.