| abstract |
The chromene compound of the present invention is represented by the following general formula (1):n n n n n n n n In the formula,n n n R 1 to R 4 may be a hydrogen atom, an alkyl group, or the like, or R 1 to R 4 may be bonded to each other to form a ring, and R 5 and R 6 may be an alkyl group, an aryl group, or the like, or R 5 and R 6 may be together; The cyclic group containing X or Y may be an aromatic hydrocarbon group or an aromatic heterocyclic group, and the divalent group Z is an alkylene group or the like.n n n Is displayed. This compound exhibits excellent photochromic properties such as small initial coloring, fast fading speed, excellent durability, and color development with a neutral color tone. |