Intermediate products and dyes based on 1-methylnaphth[2, 3-d]imidazole-4, 9-dione

Synthesis and Application of Acid Dyes Based on 3‐(4‐Aminophenyl)‐5‐benzylidene‐2‐substituted phenyl‐3, 5‐dihydroimidazol‐4‐one

“…Intensive efforts have been made in the investigation of monoazo dyes in which a heterocyclic system replaces one of the usual carboxylic systems. Many different heterocyclic diazo components have been studied, especially derivatives of thiazole, imidazole, benzimidazole owing to the marked bathochromic effect of such groups [6][7][8][9][10][11][12] A majority of acid dyestuffs are sulphonic acid derivatives of azo dyes. The free dye acids are difficult to isolate and are hydroscopic in nature making it difficult to pack and store them.…”