N.sub.1 -substituted 1h-benzytriazole hydroxyethyl sulfone compounds, a

Abstract

N.sub.1 -substituted 1H-benzotriazole hydroxyethyl sulfone compounds, a process for their preparation and their use for the preparation of dyestuffs. Compounds of the general formula ##STR1## in which R is hydrogen or alkyl which has 1 to 6 carbon atoms and can be substituted by hydroxy, sulfo, carboxy, phosphono and/or cyano, W denotes a divalent, optionally substituted aliphatic radical, (C.sub.5 -C.sub.10)-cycloaliphatic radical which is optionally substituted by alkyl, aliphatic-(C.sub.5 -C.sub.8)-cycloaliphatic radical which is optionally substituted by alkyl, optionally substituted araliphatic radical or optionally substituted aromatic carbocyclic radical, it being possible for the aliphatic radicals in W to be interrupted by hetero groups of the formulae --O--, --S--, --SO.sub.2 --, --CO--, 1,4-piperidino, --NH-- and --N(R')-- in which R' is an alkyl group which has 1 to 6 carbon atoms and can be substituted, or is an alkanoyl group having 2 to 5 C atoms, and/or for the aliphatic radicals and aryl radicals to be attached to one another through such a hetero group, and R* denotes hydrogen, alkyl having 1 to 6 carbon atoms, alkoxy having 1 to 5 carbon atoms, halogen, carboxy or sulfo. They are used as intermediates for the preparation of dyestuffs, such as fiber-reactive triphendioxazine dyestuffs, and can be prepared by reducing the nitro group in a compound of the general formula ##STR2## in which R, R* and W have the abovementioned meaning and A is a hydrogen atom or an acyl radical, to the amino group and diazotizing this amino group, whereupon cyclization takes place to give the benzotriazole, and, if necessary, subsequently eliminating the acyl radical by hydrolysis.