Verfahren zur Herstellung halogensubstituierter Diamino-dioxyanthrachinone

The invention comprises halogen-containing 4,8-diamino-1,5-dihydroxy- and 4,5-diamino-1,8 - dihydroxy - anthraquinones, obtained by halogenation of the unhalogenated bodies, which may be dissolved in dilute, concentrated, or fuming sulphuric acid, in hydrohalic acid, or in organic solvents such as halo- or nitrobenzenes. Boric acid or iodine may be present. Reaction mixtures comprising the anthraquinone starting materials and prepared by desulphonation of the corresponding disulphonic acids by heating with a reducing agent in sulphuric acid may be used. The products dye polyester, polyacrylonitrile, polyamide, polyvinyl, and triacetylcellulose fibres. Examples describe (1) the bromination of 4,8-diamino - 1,5 - dihydroxy - anthraquinone either in sulphuric acid or hydrochloric acid or trichlorbenzene or in the reaction mixture obtained by desulphonation of the corresponding 2,6-disulphonic acid in sulphuric acid with stannous chloride (or metals, phenols, amines, sugar or leuco compounds the anthraquinone employed); (2) the chlorination of 4,8-diamino-1,5-dihydroxy-anthraquinone in sulphuric acid with chlorine or in nitrobenzene with sulphuryl chloride; (3) the bromination of 4,5-diamino-1,8 - dihydroxy - anthraquinone in nitro - benzene.