Abstract The methods of synthesizing 2-carbamonyl-4-nitroaniline and 3-amino-5- nitro-2,1-benzisothiazol from 2-cyano-4-nitroaniline were studied. A series yellow pigments were prepared by using these two compounds and acetoacetarylide derivatives.
It was found that 2-cyano-4-nitroaniline can be hydrolyzed to give diazo salt of 2-carbamoyl-4-nitroaniline during diazotizing withnitrosyl sulfuric acid at 70℃. The presence of -CN and -CONH_2 in the diazocomponents, and of -OCH_3 and -CH_3 in the coupling components can imporove the shade and thermal stability of the pigments.
Zho Chun-Lung, Ma Nian-Chun .Study of Thermal Stability of Organic Pigments(Ⅳ)——Synthesis of 2-Carbamoy1-4-nitroaniline and Its Azo Pigments[J] Chemcial Industry and Engineering, 1989,V6(4): 8-17
1989, Vol. 6 
