Patent ID: 6136968
Filing Date: 2000-10-24
Classification: C07D

Abstract:
A photochromic compound of formula: ##STR30## in which: R.sub.1 represents a C.sub.1 -C.sub.16 alkyl group optionally substituted with one or more hydroxyl, halogen, aryl, alkoxy, acyloxy, acryloxy, methacryloxy or vinyl substituents; a vinyl, allyl, phenyl or arylalkyl group, a phenyl group mono- or disubstituted with C.sub.1 -C.sub.6 alkyl or alkoxy or halogen substituents, an optionally substituted alicyclic group, or an aliphatic hydrocarbon group containing in its chain or more hetero atoms chosen from O, N and S;R.sub.2 and R.sub.3 denote, independently of each other, a hydrogen atom; an alkyl group; an aryl group; a group --(CH.sub.2).sub.m OR, --SR, --COR or --COOR, in which R denotes a hydrogen atom, an alkyl group or an aryl group and m is an integer from 0 to 10; an amino group of formula NR.sub.4 R.sub.5 in which R.sub.4 and R.sub.5 denote, independently of each other, a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, it being possible for R.sub.4 and R.sub.5 to form, with the nitrogen atom, a 4- to 7-membered heterocycle which can also contain one or more endocyclic hetero atoms chosen from nitrogen, oxygen and sulfur; a halogen atom; a mono- or polyhaloalkyl group; an --NO.sub.2, --CN or --SCN group; a group SO.sub.3 R' in which R' denotes hydrogen or an alkali metal, a group SO.sub.2 R"" in which R"" is a phenyl or tolyl group; or an acrylic, methacrylic, vinyl or allylic polymerizable group optionally containing a long chain; H is a 4- to 7-membered and preferably 5- or 6-membered aromatic heterocycle or an aromatic hydrocarbon-based ring, the heterocycle containing one or more endocyclic hetero atoms chosen from nitrogen, oxygen and sulfur, it being possible for these rings and heterocycles to be substituted with one or more groups as defined for R.sub.2 and R.sub.3, fused with an aromatic or cycloalkyl ring.