Importance

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Abstract

A compound of the formula (I) or (II): ##STR1## where R.sup.1, R.sup.2, R.sup.5 and R.sup.6 are the same or different and represent a hydrogen atom or a halogen atom and R.sup.1 and R.sup.2 may combine to form a ring; R.sup.3, and R.sup.4 are the same or different and represent a hydrogen atom, a halogen atom, a benzoyl group, a group of the formula --L(CH.sub.2).sub.n R.sup.8 where n is 1 to 8, R.sup.8 is a hydrogen, hydroxy, amino, dialkylamino, --COR.sup.16 or --COOR.sup.14 where R.sup.16 is a hydrogen, chlorine, COCl, C.sub.1 -C.sub.8 alkyl, --NR.sub.2 or aryl and R.sup.14 is a hydrogen, C.sub.1 -C.sub.8 alkyl, aryl, COR, 2,4-dinitrophenyl, N-imido or --NR.sub.2 and L is a direct bond or C.dbd.O; W is .dbd.O; W.sup.1 is hydrogen or --OR.sup.9, where R.sup.9 is hydrogen, C.sub.1 -C.sub.8 alkyl, acyl or a group of the formula --(CH.sub.2).sub.n R.sup.10 where n is 1 to 8 and R.sup.10 is amino, dialkylamino, hydroxy, acryloyl or methacryloyl; Y is oxygen, sulfur, selenium, tellurium, C.dbd.O, or >N--R.sup.13 is where R.sup.13 is 4-methylphenyl, and A is hydrogen, alkenyl, dichlorotriazinylamino, or an electron withdrawing group selected from the group consisting of COOR.sup.11, C(O)OCOR.sup.11, CONR.sub.2, CN, NO.sub.2, NCS, NCO, SO.sub.2 R.sup.12, SO.sub.3, R.sup.12, SO.sub.3 R.sup.11, SO.sub.2 NR.sub.2 and CX.sub.3.sup.2 where X.sup.2 is the same or different and is a halogen atom and R.sup.11 is hydrogen, alkyl, aryl, or aralkyl, and R.sup.12 is hydrogen, alkyl, aryl, or aralkyl; provided that when R.sup.1 -R.sup.6 are all hydrogen, A is not hydrogen.

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First Claim