HSDB 4231

Preparation

4-(4-Aminophenyl)benzenamine double nitriding, respectively with 2-Hydroxybenzoic acid and 5-Oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylic acid (22370). 4-(4-Aminophenyl)benzenamine double nitriding, respectively with 2-Hydroxybenzoic acid??and 4-(3-Methyl-5-oxo-4,5-dihydropyrazol-1-yl)benzenesulfonic acid coupling (22375). Benzidine double nitriding, respectively with the 2-Hydroxy-3-methylbenzoic acid and 4-(3-Methyl-5-oxo-4,5-dihydropyrazol-1-yl)benzenesulfonic acid coupling (22430).

Properties and Applications

yellow orange. Soluble in water for orange, slightly soluble in ethanol for bright yellow, and soluble in acetone and soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid for blu-ray red to purple, diluted red for yellow, with dark brown precipitation. The dye solution to join strong sodium hydroxide solution for big red.