Dyestuffs comprising two 5-membered heterocyclic nuclei fused to a central cyclohexadiene nucleus, processes for their preparation and their use for colouring synthetic textile materials

Claim 1

Dyestuffs of the general formula (I): wherein Z 1 and Z 2 are oxygen, sulphur or Y 1 in which Y 1 is an optionally substituted hydrocarbon radical or an acyl radical; radical; R 3 and R 4 each represent a naphthyl radical, an unsubstituted phenyl radical or a phenyl radical substituted by at least one of the following:- nitro, halogen, lower alkyl, lower alkoxy, phenyl, hydroxy, lower alkoxyphenyl, phenoxy, cyano, carboxylic acid, carboxylic acid ester, optionally substituted carbamoyl, sulphonic acid, sulphonyl chloride, sulphonic acid ester, optionally substituted sulphamoyl, mercapto, lower alkylthio, phenylthio, primary, secondary, tertiary or quaternary amino, acylamino, phosphonic acid, phosphonic acid ester, lower alkylsulphonyl, phenylsulphonyl, aldehyde, azo, and acyloxy groups of the formula O.CO.T in which T 1 is an alkyl group containing at least two carbon atoms, a substituted phenyl group, a lower alkoxy group or a phenoxy group; X 3 and X each independently represent a hydrogen aton, chlorine, bromine, cyano, lower alkyl, lower alkoxy, optionally subotituted aryl, optionally substituted carbamcyl, optionally substituted sulphamoyl, carboxylic acid or carboxylic acid ester group, provided that Z 1 and Z 2 may be the same or different when R 3 and R 4 are different, and Z and Z 2 are different when R 3 and R 4 are the sane.