Patent ID: 7892296
Filing Date: 2011-02-22
Classification: C07D,C09B,G02B,G03C

Abstract:
1. Photochromic benzopyrans with the general formula (I): in which the R or the R or the R X is a mono- or diatomic bridge, where X in the case of a monoatomic bridge is selected from O and CR where the R where X, in the case of a diatomic bridge, is formed from the —Y—Z— moiety, where Y and Z are each independently selected from O, CR where the R or Y and Z are joined to one another via a radical in each case to form a 4- to 8-membered carbocyclic ring, where the ring members may each independently bear one or more substituents selected from the group α; with the proviso that, in the case of a diatomic bridge, only a maximum of one carbobicyclic or carbotricyclic system is present, and that Y and Z are not both O; and B and B′ are each independently selected from one of the following groups a), b) and c): a) mono-, di- and trisubstituted aryl radicals, where the aryl radical is phenyl, naphthyl or phenanthryl; b) unsubstituted, mono- and disubstituted heteroaryl radicals, where the heteroaryl radical is pyridyl, furanyl, benzofuranyl, thienyl, benzothienyl, 1,2,3,4-tetrahydrocarbazolylor julolidinyl; c) B and B′ together with the adjacent carbon atom of the pyran ring form an un-, mono- 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