3-Amino-4-hydroxybenzenesulfonic acid diazotization, and 7-Aminonaphthalen-2-olcoupling, product to diazotization, with 3-Methyl-1-phenyl-1H-pyrazol-5(4H)-one coupling.
Properties and Applications
red light brown. Soluble in water for brownish red. In concentrated sulfuric acid to blue light red. Dye aqueous solution to join concentrated hydrochloric acid have brown light red precipitation; Plus dilute sodium hydroxide solution for orange brown.
