Urea → HCID 11075766, compound

Participants

Reaction Steps

31.4 g 2,4-dicyanoaniline were diazotised with 72 g nitrosylsulphuric acid at 0 to 5° C. in 300 ml of 50% aqueous sulphuric acid and the batch was subsequently stirred for 1 hour. The reaction mixture was slowly added to a solution of 20.4 g aniline and 4.5 g urea in 300 ml 50% aqueous sulphuric acid, the temperature being held at 0° C. After stirring for a further 1 hour, the pH of the reaction mixture was adjusted to 5.5 with sodium carbonate, and the precipitate was filtered off under suction, washed with water, and dried. 34 g of red 4-amino-2′,4′-dicyano-azobenzene were obtained. The product was used further without purification.

Provenance & Evidence