Question

Write the mechanism of Perkins reaction

Answer 1

The generally accepted mechanism of the Perkin reaction is represented by the following steps:

Involves the abstraction of proton by the carboxylate ion to form the resonance stabilized carbanion, which is a species containing carbon with a negative charge.
Involves the nucleophilic addition of the carbanion to the carbonyl carbon atom of the aldehyde to form a tetrahedral intermediate
The tetrahedral intermediate is protonated by the acetic acid formed in the process.
Involves the elimination of water molecule from the hydroxy derivative.
Hydrolysis, which is the addition of water, of the unsaturated compound to the unsaturated acid occurs.

Answer 2

The Perkins reaction is an organic reaction develop to english chemist William Henry Perkins that is used to make cinnamic acids .It gives an alpha,beta unsaturated aromatic acid by the aldol condensation of an aromatic aldehyde and an acid anhydride, in presence of an alkali salt of the acid..