Dyes containing hydrazino groups

In examples, (6), N-b -(11-acetylaminonaphthalene - 51- sulphonylamino) ethyl - N1 - isopropylidene-hydrazine is made by reacting 1-acetylamino naphthalene - 5 - sulphonic acid chloride with N-b -aminoethyl-N1- isopropyl-idene-hydrazine; (9), N-b -aminoethyl-N-phenyl-hydrazine is made by reacting phenylhydrazine with chloroethylamine hydrochloride, neutralising and fractioning the product; and (10) N-b -aminoethyl-N1-isopropylidene-hydrazine is made by reacting acetone with b -aminoethyl hydrazine.ALSO:The invention comprises dyes of the azo, anthraquinone and tetrazaporphin series containing at least one group of the formula where R is hydrogen, substituted or unsubstituted alkyl, cycloalkyl, aryl or aralkyl, A is alkylene with two to six carbon atoms in the alkylene chain and X is a hydrazino group containing at least one free hydrogen atom. The dyes are made by reacting a sulphonic acid halide of a dye or of a dye precursor of the aminobenzene sulphonic acid or aminonaphthalene sulphonic acid series with an amine of the formula: R-NH-A-X, in which the hydrazine group may be protected by an acyl or alkylidene group, in a solvent or diluent at about 0 DEG to 90 DEG C., or by reacting a sulphonic acid alkylene imide or a mineral acid ester of a sulphonic acid hydroxy-alkylamide of a dye or a dye precursor of the aminobenzene, sulphonic acid or aminonaphthalene sulphonic acid series with a hydrazine having at least two free hydrogen atoms and, when a precursor is used, reacting the product with a dyestuff sulphonic acid halide or coupling it with a diazotized amine. Examples are given. The dyes may be converted into the corresponding methylol or methylol ether derivatives. They dye natural or regenerated textile materials.