Patent ID: 7229989
Filing Date: 2007-06-12
Classification: C07D,C09K

Abstract:
1. A photochromic 3H-naphtho[2,1-b]pyran compound corresponding to formula (I): wherein R R wherein R2 may optionally be substituted with one, two, three or four substituents selected from the group β; or R2 is a Y-naphthyl group, where Y is a linker between the naphthyl group and the naphthopyran unit, said linker Y being selected from the group consisting of a single bond, CH R R B and B′ independently of one another are selected from unsubstituted, monosubstituted or disubstituted phenyl, ethynyl, ethenyl, naphthyl, furanyl, benzofuranyl, thienyl, benzothienyl or julolidinyl, whereby the substituents are selected from the a group as well as ethenyl, 4-ethenylphenyl, ethynyl or 4-ethynylphenyl, where the substituents from the αgroup as well as the substituents listed above, again independently of one another, may each have two or three substituents from the β group or whereby two directly vicinal substituents may form an X—(CH