Triazolylstyryl triazoles

Abstract

The present invention provides novel compounds of the formula: ##SPC1## In which R.sub.1 signifies hydrogen, fluorine or chlorine atom, a carboxylic or sulphonic acid group or an amide or ester thereof, a cyano group or an alkylsulphonyl or arylsulphonyl group, R.sub.2 signifies a hydrogen, fluorine or chlorine atom, a cyano group, a phenyl or alkyl radical which may be substituted, a carboxylic or sulphonic acid group or an amide or ester thereof, an alkylsulphonyl or arylsulphonyl group or a benzoxazole group which may be substituted, R.sub.3 and R.sub.4 independently signify a hydrogen, fluorine or chlorine atom, an alkyl radical of 1 to 6 carbon atoms which may be substituted, a cyano or carboxy group, a carboxylic acid amide or ester group, and R.sub.4 may also signify an aryl radical which may be substituted, and A signifies a hydrogen atom or an alkyl or aryl radical which may be substituted or a group of formula II, B--CH = CH-- II in which B signifies an aryl or heterocyclic radical which may be substituted, And their water soluble sulphonated derivatives. The compounds are useful as optical brighteners for various organic materials.

Dependencies are inferred from the claim text.