Methanol → 2-Propenoic acid, 3-[4-(acetylamino)phenyl]-2-cyano-, methyl ester

Participants

Reaction Steps

A mixture of p-acetamidobenzaldehyde (4.08 g, 0.025 m), methyl cyanoacetate (2.50 g, 0.026 m), methanol (75 ml) and piperidine (10 drops) is heated and stirred at reflux for 0.5 hour. The reaction mixture is cooled and the pale yellow solid collected by filtration and dried in air. Recrystallization of the product from 50/50 isopropanol/toluene (by volume) gives 4.5 g of pure UV absorber product by mass spectrum analysis which has an absorption maximum at 346 nm in methylene chloride.

Provenance & Evidence