Benzaldehyde → 5-Benzylidenehydantoin

Participants

Reaction Steps

A 37.5 g amount of glycine and 26.5 g of sodium carbonate were dissolved in 200 ml of water in the flask. Then, 53.0 g of benzaldehyde and 50.0 g of hydantoin were added to the resultant solution. The mixture was allowed to react at a temperature of 100° C. for 1 hour while stirring. During the reaction, the pH of the reaction mixture was 9.7 to 9.4. After cooling, the precipitated 5-benzylidene hydantoin was separated and recovered from the reaction mixture. Thus, 83.0 g of 5-benzylidene hydantoin was obtained. The yield was 88% based on the hydantoin.

Provenance & Evidence