| abstract |
(57) [Summary] (Modified) [Object] To provide a photochromic compound, more specifically, a photochromic compound containing a ring of chromene or benzobilane in its chemical structural formula. [Structure] A photochromic compound of the following formula, and a method of using these compounds for ophthalmic optics. [In the formula, R a , R b, and R C are each a hydrogen atom, an alkyl group, an aryl group, OR, SR, COR, or COOR. Wherein R is a hydrogen atom, an alkyl group, an aryl group, a group NR 1 R 2 , and R 1 and R 2 are a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, NR 1 R 2 can form a 4-membered to 7-membered heterocyclic ring, m and n are integers of 1 to 5, and P is 1 H is a 4- to 7-membered heterocycle containing one or more heteroatoms selected from nitrogen atom, oxygen atom and sulfur atom. ] |