GB258563A - Manufacture of dyestuffs - Google Patents

Abstract

258,563. Soc. of Chemical Industry in Basle. Sept. 16, 1925, [Convention date]. Addition to 237,375. Sulphuretted dyes.-The process of the parent Specification, according to which 2 : 5-diarylidobenzoquinones are treated with sulphur halide, is modified by using instead of the latter a mixture of a sulphur dihalide and halogen. The reaction may be effected in presence of a solvent or diluent, with or without an acid-binding or condensing agent, and at ordinary or high temperature. The 2 : 5-diarylidoquinones may contain further substituents in the quinone nucleus or at the nitrogen atoms and may also contain substituents in the arylido-residues such as halogen, alkyl-, alkyloxy-, phenyloxy-, nitro-, amino-, alkylamino-, aralkylamino-, arylamino-, hydroxyl-, or carboxyl-groups. As diluents, which may also act as condensing agents, are specified nitrobenzene, chlorbenzene, carbon tetrachloride, chlorethane, sulphuric acid, formic acid, acetic acid, and acetic anhydride; zinc chloride and iodine are mentioned as condensing agents. The following diarylidobenzoquinones are specified as parent materials, the sulphurizing being effected with sulphur dichloride mixed with varying proportions of chlorine at temperatures of from -15‹ C. to the boiling point of nitrobenzene :-2 : 5-dianilidobenzoquinone, 2:5-dianilido-6-methylbenzoquinone, 2 : 5-dianilido-6-chlorbenzoquinone, and 2 : 5-di-a-or #-naphthylaminobenzoquinone. The products dye wool from the hydrosulphite vat in yellow, orange, violet, brown, blue, grey, and black &c. shades.