3-Amino-4-hydroxy-5-nitrobenzenesulfonic acid diazotization, and 4-(3-Methyl-5-oxo-4,5-dihydropyrazol-1-yl)benzenesulfonic acid coupling.
Properties and Applications
dark yellow red. Soluble in water for yellow orange. In concentrated sulfuric acid to yellow, after diluted solution for yellow; In concentrated hydrochloric acid for yellow solution; In concentrated sodium hydroxide solution for brown.
