Hydrochloric Acid → 2,4-Imidazolidinedione, 5-[(2-chlorophenyl)methylene]-

Participants

Reaction Steps

A mixture of o-chlorobenzaldehyde (2.50 g.) and hydantoin (1.78 g., 1 molar ratio) was treated with water (15 ml) and heated to 70°. Monoethanolamine (1.63 g., 1.5 molar ratio) was added and the mixture was stirred magnetically at 90°-92° (bath temperature) for 4.25 hours. The mixture was cooled in an ice-bath, acidified with concentrated HCl, refrigerated overnight, filtered, washed with water and dried at 55°/10 mm. The title compound was obtained as a pinkish solid (2.63 g.), m.p. 266°-270° decomp.

Provenance & Evidence