Phthalimidyl-azo-m-acylamido-n-substituted aniline compounds and polyester fibers dyed therewith

A compound having the formula ##STR26## wherein R and R.sup.2 are the same or different and each is alkyl containing one to eight carbon atoms;

• cyclohexyl;
• cyclohexyl substituted with lower alkyl;
• arylmethyl;
• arylethyl;
• cyclohexylmethyl;
• 2-cyanoethyl or a group having the formula --Z--R.sup.9 in which Z is ethylene, propylene, trimethylene or tetramethylene and R.sup.9 is lower alkoxy, aryloxy, lower alkanoyloxy, lower alkoxycarbonyl, lower alkoxycarbonyloxy, aroyloxy or ##STR27## wherein R.sup.4 individually is hydrogen, lower alkyl or aryl;
• R.sup.5 individually is hydrogen or lower alkyl;
• R.sup.4 and R.sup.5 taken together are --(CH.sub.2).sub.5 -- or --CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 --;
• R.sup.6 is hydrogen, lower alkyl, aryl, or cyclohexyl;
• R.sup.7 is ethylene, propylene, trimethylene, o-cyclohexylene, or o-arylene;
• X is --CH.sub.2 --, --CO--, or --SO.sub.2 --;
• and
• R.sup.8 is aryl, benzyl, cyclohexyl, 1,2,4-triazol-3-yl, or 2-benzothiazolyl;
• A is lower alkanoyl;
• lower alkanoyl substituted with chlorine, bromine, aryl, cyano, lower alkoxy, benzyloxy, lower alkylthio, aryloxy or lower alkylsulfonyl;
• lower alkoxycarbonyl;
• or aroyl;
• R.sup.1 is hydrogen or methyl, one of R.sup.1 and R.sup.3 being hydrogen;
• R.sup.3 is hydrogen, lower alkyl, arylmethyl, arylethyl, allyl, aryl, or a group having the formula --Z--R.sup.10 in which Z is ethylene, propylene, trimethylene, or tetramethylene and R.sup.10 is lower alkoxy, aryloxy, lower alkanoyloxy, lower alkoxycarbonyl, or lower alkoxycarbonyloxy.