GB687328A - Process for the preparation of disazo dyestuffs - Google Patents

Abstract

The invention comprises disazo dyestuffs of the formula <FORM:0687328/IV (c)/1> where R1 is a benzene or naphthalene residue containing an o-metallizable group, X is hydrogen or sulphonic acid, the -CH3 and -N= N-R3 groups are in the 3 : 4- or 4 : 3-positions of Y and R3 is the residue of one of the following acylaminonaphtholsulphonic acids:-1 : 5 : 7, 2 : 5 : 7, 1 : 8 : 4, 1 : 8 : 6, 2 : 8 : 6 or disulphonic acids 2 : 5 : 1 : 7, 1 : 8 : 3 : 6, 1 : 8 : 4 : 6. These are made by coupling a diazotized o-metallisable amine with a 2-aminotoluylamino-5-naphthol-7-sulphonic acid or -1 : 7-disulphonic acid, diazotizing the resulting monoazo dyestuff and coupling it with the appropriate acylaminonaphtholsulphonic acid. The products dye cotton and regenerated cellulose in red to violet shades. They may be metallized (e.g. with copper sulphate) in substance or on the fibre. Examples show the preparation of the following dyestuffs:-(1) 2-aminophenol-4-sulphonic acid --> N - (3 - methyl - 4 - aminobenzoyl) - J acid --> N-cinnamoyl-J acid; (2) anthranilic acid --> N-(3-methyl-4-aminobenzoyl)-J acid --> N-carbethoxy-J acid; (3) 2-amino-3-naphthoic acid --> N-(3-methyl-4-aminobenzoyl)-J acid --> 2 - benzoylamino - 5 - naphthol - 1 : 7 - disulphonic acid; (4) 2-amino-6-chlorophenol-4-sulphonic acid --> N-(3-methyl-4-aminobenzoyl)-J acid --> 2-(p-benzoylamino-benzoylamino)-5-naphthol-1 : 7-disulphonic acid; (5) anthranilic acid --> N-(3-methyl-4-aminobenzoyl)-J acid --> N-benzoyl-J acid. A table is given of further dyestuffs obtainable according to the invention and additional components are listed. Some of the components contain sulphonamide groups, e.g. 2-aminophenol-4-sulphonic-(41-hydroxy-31 -carboxyanilide).