Yellow and orange azocoumarin disperse dyes - produced by more rapid methods giving higher yields

摘要

Prepn. of azocoumarin dispense dyes of formula (I) In the formula, A is a diazolizable base substd. by alkyl, alkoxyl, halogen, sulphomethyl, sulphamido, cyano, nitro or acetamido, or coupling agent substd. by N-dialkylamine, alkyl, alkoxyl, acetamido or cyano; R' = H, 1-4C alkyl or alkoxy or halogen; R2 = R' or acylamino; R3 = H or 1-4C alkyl, N-dialkylamino or N-(alkyl, cyanoalkyl) amino). Process comprises reacting, in approx. equimolar amts in an inert org. solvent, an intermediate of formula (II):- (where R4 = 1-4C alkyl) and a salicylaldehyde of formula (III). The intermediates are novel cpds. obtd. by condensation of an aminoazo cpd. with a malonic ester in an inert org. solvent (e.g. MeOH, DMF, chlorobenzene). The prods. are yellow and orange dyes giving high colour yields and dyeings or prints of good fastness to light, humidity and heat treatments on polyester and polyester-cotton materials, and are esp. useful for application by therofixation.