Patent ID: 8236716
Filing Date: 2012-08-07
Classification: C07D,C09K

Abstract:
1. Photochromic benzopyranobenzopyrans with additional fusion with the general formula (I): in which at least one of the R with the proviso that R or in which the R and in which the R the R the R the R the R R or two R the R or R in the case of coupling of the above unit (A) via R R m is 0, 1, 2 or 3, and B and B′ are chosen, independently of one another, from one of the following groups a), b) or c), a) being mono-, di- and trisubstituted aryl radicals, the aryl radical being phenyl, naphthyl or phenanthryl; b) being unsubstituted, monosubstituted and disubstituted heteroaryl radicals, the heteroaryl radical being pyridyl, furanyl, benzofuranyl, thienyl, benzothienyl, 1,2,3,4-tetrahydrocarbazolyl or julolidinyl; c) B and B′ forming, together with the adjacent carbon atom of the pyran ring, an unsubstituted, monosubstituted or disubstituted 9,10-dihydroanthracene, fluorene, thioxanthene, xanthene, benzo[b]fluorene, 5H-dibenzo[a,d]cycloheptene or dibenzosuberone radical or a saturated hydrocarbon radical which is (C