Importance

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Abstract

Photochromic compounds having the following structure II ##STR1## in which R.sup.1 is a group selected from hydrogen, alkyl, alkoxy, amino, aryl or heteroaryl; each R.sup.2 is a group selected from C1 to C10 branched or linear alkyls, carbocylic or heterocyclic, the R.sup.2 groups can be independent or together from part of a carboxylic or heterocyclic ring; R.sup.3 is a group selected from hydrogen, alkyl, alkoxy, alkenyl, alkynyl, imino, azo, amino, carboxy ester, amide, cyano, halogen, trifluoromethyl, nitro, aryl or heteroaryl, R.sup.3 is a fused carbocyclic or heterocyclic moiety; Y is a six membered carbocyclic or heterocyclic ring. X links N as shown to the ring Y to form a fused heterocyclic ring.

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First Claim