Preparation
(a) 4-Aminobenzenesulfonic acid diazotization, and 5-Oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylic acid coupling; (b) 2 Moore 4-Hydrazinobenzenesulfonic acid?and Dioxo acid reaction to C.I. acid yellow 23 (C.I. 19140). 3-(Ethylamino)-4-methylphenol and Phthalic anhydride condensation, the product with ethanol and inorganic acid esterification; O-Methylaniline?with chloroethane alkylation, sulfonation, alkali fusion, and Phthalic anhydride condensation, then?ethyl chloride esterification?C.I. Basic Red 1 (C.I. 45160). Then two dye into complex.
