Patent ID: 6967249
Filing Date: 2005-11-22
Classification: C07D,G02B,G03C

Abstract:
1. A photochromic 3H-naphtho[2,1-b]-pyran compound corresponding to formula (I) wherein R a linear or branched (C R R R R NR B is selected from the group consisting of a julolidinyl group bound via the 3 position to the pyran ring; a phenyl or naphthyl group, monosubstituted or disubstituted in the ortho or para position, the substituent or substituents being a —NR B′ is selected from the group consisting of phenyl and naphthyl, wherein said phenyl or naphthyl is unsubstituted or monosubstituted, disubstituted or trisubstituted in the ortho or para position with substituents selected from the group consisting of linear or branched (C wherein the phenyl or naphthyl groups of B and B′ may independently be attached directly, via an ethylene group or an ethinediyl group to the 3,3′-position of the 3H-naphtho[2,1-b]-pyran system.