CHROMENE COMPOUNDS

摘要

Chromene compounds characterized by developing a yellow to red color with a high color density and having a low initial color density. When used in combination with an existing photochromic compound assuming a blue color so as to develop an intermediate color, the chromene compounds can retain the evenness of color tone during coloration and discoloration or have an extremely high discoloration rate. The chromene compounds are ones having a naphthopyran ring skeleton having in its 6-position a substituent bonded through a nitrogen atom, such as a substituted amino group or a morphorino group, and further having in the 3-position two aryl groups each having a specific substituent. An example of the chromene compounds is represented by formula (8) or (9).