Photochromic compound, composition and use thereof.

摘要

Disclosed is a compound represented by the following general formula(I): <CHEM> wherein R1 and R2, which may be the same or different, represent a hydrogen atom, an alkyl group, an aryl group, an aralkyl group or a substituted amino group, R3 and R4, which may be the same or different, represent an alkyl group, or R3 and R4 together form a nobornylidene group or bicyclo[3,3,1]9-nonylidene group which may have a substituent, and <CHEM> represents a divalent aromatic hydrocarbon group or divalent unsaturated heterocyclic group which may have a substituent, with the proviso that when R3 and R4 represnet an alkyl group, <CHEM> represents a bicyclic aromatic fused ring which is substituted with at least one substituent selected form the group consisting of a halgoen atom, an alkyl group, an alkoxy group, -R5- S-R6 and <CHEM> (in which R5 represents an alkylene group or &lparstr& O-R8 &rparstr& @ (in which R8 represents an alkylene group and n is a positive integer), R6 and R7, which may be the same or different, represent an alkyl group, and X represents <CHEM> at least one of the substituents beign an alkyl group having 6 to 20 carbon atoms, an alkoxy group having 6 to 20 carbon atoms, <CHEM> a composition comprising this compound, and a photochromic lens composed of this composition.