A process for the manufacture of dianthraquinonyl-N,N'-dihydroazine, which comprises reacting 1-nitroanthraquinone in mixtures of water, alcohols and alkali metal hydroxides at elevated temperature with hydrazine or hydroxylamine compounds, subsequently removing the alcoholic constituents from the reaction mixture, adding dimethyl sulfoxide, and, if desired, further amounts of alkali metal hydroxides, and bringing the reaction to completion at elevated temperature.
This application is a continuation of application Ser. No. 149,125, filed May 8, 1980, which application is in turn a continuation of application Ser. No. 33,406, filed Apr. 6, 1979 (both now abandoned).
