Acetate → Pigment Yellow 213

Participants

Reaction Conditions

Reaction Steps

0.1 mol of dimethyl aminoterephthalate hydrochloride is diazotized with sodium nitrite at from 0 to 10° C. The clarified diazonium salt solution is added dropwise at room temperature over 1 hour to an acetate-buffered suspension of 0.1 mol of N-acetoacetyl-6-methoxy-7-aminoquinoxaline-2,3-dione in the presence of a sufactant, such as ®LUTENSOL AT 25. When coupling is at an end the mixture is heated to 96° C.and the product is filtered and washed free of salt. The moist presscake is suspended in N-methylpyrrolidone, the water is removed by distillation and the product is subsequently heated at from 100 to 170° C. It is then cooled to 70° C., filtered, dried and milled. This gives 51 g of a yellow pigment.

Provenance & Evidence