Abstract: Monoazo dyes of the formula ##STR1## is optionally substituted thiazolyl, benzothiazolyl, 1,2,4-triazolyl, indazolyl, imidazolyl or pyridyl or naphtho-[2,1-d]-thiazolyl,R.sub.1 is optionally substituted alkyl, phenylalkyl, cycloalkyl or alkenyl,each of R.sub.2 and R.sub.3 is independently optionally substituted alkyl,R.sub.4 is hydrogen or optionally substituted alkyl, phenylalkyl, cycloalkyl or phenyl,R.sub.5 is hydrogen or optionally substituted alkyl, orR.sub.4 and R.sub.5 taken together and with the nitrogen atom to which they are joined are optionally substituted saturated heterocyclyl,R.sub.6 is hydrogen or methyl, andA.sup..crclbar. is an anion,with the proviso that the molecule is free of sulfo groups,are useful for the dyeing and printing of basic dyeable substrates, e.g., materials comprising or consisting of homo- or mixed-polymers of acrylonitrile or asymmetrical dicyanoethylene or synthetic polyamides or polyesters modified to contain acid groups, leather and paper.

Abstract: Novel basic, styryl dyes containing no sulphonic acid groups and of formula ##SPC1##In which the radicals R, which may be the same or different, signify unsubstituted or substituted hydrocarbon radicals,R.sub.1 signifies an unsubstituted or substituted alkyl radical,EitherI. R.sub.6 signifies a hydrogen atom,R.sub.2 signifies an unsubstituted alkyl radical or an alkyl radical substituted by one or more halogen atoms or cyano, aryl or alkoxy radicals,AndR.sub.3 signifies an unsubstituted alkyl radical, an alkyl radical substituted by one or more halogen atoms or cyano, aryl or alkoxy radicals, an unsubstituted aryl radical or an aryl radical substituted by one or more halogen atoms or alkyl alloxy or cyano radicals.Ii. R.sub.6 signifies a hydrogen atom, and R.sub.2 and R.sub.3 together with the nitrogen atom to which they are attached signify a saturated or partially saturated, heterocyclic ring of 5 to 7 ring members,Or iii. R.sub.