| abstract |
A chromene compound represented by the generalnformula (1),n n wherein R 1 to R 4 are hydrogen atoms, hydroxylngroups, alkyl groups, alkoxy groups, substitutednamino groups or halogen atoms, R 1 to R 4 may benbonded together to form a ring; R 5 and R 6 arenalkyl groups, aryl groups or heteroaryl groups,nor R 5 and R 6 together may form a ring, a cyclicngroup containing X or Y is an aromaticnhydrocarbon group or an aromatic heterocyclicngroup, and a divalent group Z is an alkylenengroup. n This compound exhibits excellent photochromicnproperties, such as small initial color, a largenfading rate, excellent resistance and developing ancolor tone of a neutral tint. |