(a) 1,5-Dimethoxyanthracene-9,10-dioneand 1,8-Dimethoxyanthracene-9,10-dionemixture dinitration, reduction, ethyl products and chemical. In the process of preparing sulphonated medium armor oxygen radicals hydrolysis, then into sodium salt; (b) in the presence of copper, Ethanamineand 1,5-Dihydroxy-4,8-dibromoanthraquinoncondensation, and then sulphonated; (C)1,5-Dihydroxy-9,10-dioxo-9,10-dihydroanthracene-2,6-disulfonic acidand 1,8-Dihydroxy-9,10-anthraquinone-2,6-disulfonic acidmixture brominated, and then in the presence of copper and Ethanaminecondensation.
