Heterocyclic monoazo dyes for polyester fibers

A monoazo dye of the formula:

• ##STR37## wherein D is selected from the group consisting of unsubstituted thiazolyl, unsubstituted benzothiazolyl, unsubstituted thiadiazolyl, unsubstituted pyridyl, unsubstituted thiazolyl, benzothiazolyl substituted with methyl, chlorine, bromine, nitro, C.sub.1 -C.sub.8 alkoxycarbonyl, methoxycarbonyl, ethoxycarbonyl, trifluoromethyl, methylsulfonyl, formyl, b,b-dicyanovinyl or b-cyano-b-alkoxycarbonylvinyl, thiadiazolyl substituted with C.sub.1 -C.sub.8 alkyl, phenyl, benzyl, phenethyl, cycloalkyl, C.sub.1 -C.sub.8 alkylthio, C.sub.1 -C.sub.8 alkylsulfinyl, C.sub.1 -C.sub.8 alkylsulfonyl, cyano, chlorine, arylthio, arylsulfinyl, or arylsulfonyl, and pyridyl substituted with chlorine, bromine, nitro, methyl, methylsulfonyl, or cyano;
• X is selected from the group consisting of H, Cl, CH.sub.3, OCH.sub.3, and acylamino selected from the group consisting of acetylamino, chloroacetylamino, benzoylamino, methylsulfonylamino, chloropropionylamino, ethoxycarbonylamino, and ethylaminocarbonylamino;
• Y is selected from the group consisting of H, Cl, CH.sub.3, alkoxyl selected from the group consisting of CH.sub.3 O and CH.sub.3 CH.sub.2 O, and alkoxyalkyl selected from the group consisting of methoxymethyl and ethoxyethyl,
• R.sup.1 is selected from the group consisting of branched or unbranched C.sub.1 -C.sub.8 alkyl;
• alkoxyalkyl selected from the group consisting of methoxyethyl, ethoxyethyl, and butoxyethyl;
• alkoxyalkoxyalkyl selected from the group consisting of methoxyethoxyethyl and ethoxyethoxyethyl;
• phenoxyethyl;
• aralkyloxy (C.sub.1 -C.sub.8) alkyl which may be unsubstituted or substituted with chlorine, hydroxyalkyl selected from the group consisting of hydroxyethyl, hydroxypropyl, hydroxybutyl, hydroxyhexyl and 2-hydroxy-3-methoxypropyl;
• cyano(C.sub.1 -C.sub.2)alkyl, acyloxyalkyl selected from acetyloxyethyl, chloroacetyloxyethyl, chloropropionyloxyethyl and benzoyloxyethyl;
• alkoxycarbonyloxy alkyl selected from the group consisting of methoxycarbonyloxyethyl and methoxyethoxycarbonylethyl;
• carbamoyl(C.sub.1 -C.sub.2)alkyl;
• alkoxycarbonyl alkyl selected from the group consisting of methoxycarbonylmethyl, ethoxycarbonylmethyl, methoxycarbonylethyl, ethoxycarbonylethyl, methoxycarbonylpropyl, ethoxycarbonylpropyl, methoxyethoxycarbonylmethyl and benzyloxycarbonylmethyl;
• aralkyl selected from the group consisting of benzyl, phenethyl and chlorobenzyl;
• allyloxycarbonyl(C.sub.1 -C.sub.2)alkyl;
• tetrahydrofurfuryl;
• succinimido ethyl, phthalimido ethyl, cyanoalkoxyalkyl selected from the group consisting of cyanoethoxyethyl and cyanomethoxyethyl;
• chloroethyl, alkenyl selected from the group consisting of allyl and crotyl;
• and aryl selected from the group consisting of phenyl, chlorophenyl and tolyl;
• and
• R.sup.2 is selected from the group consisting of phenoxymethyl, phenoxyethyl, benzyl and tetrahydrofurfuryl.