Acetic Acid → 80540-68-7

Participants

Reaction Steps

Tolualdehyde (400 g), cyanoacetic acid (311 g), acetic acid (60 ml) and ammonium acetate (25.6 g) were refluxed in ethyl alcohol (1.6 l) for 4 hours with heating. After the reaction, the mixture was concentrated to 600 ml by removing ethyl alcohol under a reduced pressure, followed by pouring into 1 liter of ice-cold water to separate crystals. The separated crystals were filtered out by suction and recrystallized from 2 liters of ethyl alcohol to obtain 2-cyano-3-(4-methylphenyl)acrylic acid which melted at 210°-215° C. in a yield of 560 g. The resulting compound (320 g) and thionyl chloride (252 g) were dissolved in acetonitrile (200 ml) with heating for 1 hour. After the reaction, acetonitrile and thionyl chloride were distilled off under a reduced pressure, and the resulting solid was added to a solution consisting of hydroxyethyl methacrylate (244.8 g), pyridine (149 g) and acetonitrile (2 l). The reaction was carried out for 2 hours while keeping the reaction temperature below 40° C. After the reaction, the reacting solution was poured into ice-cold water to separate crystals, and the resulting crystals were recrystallized from ethyl alcohol (3 l) to obtain 360 g of the desired product which melted at 74°-75° C.

Provenance & Evidence