| abstract |
The present invention relates to a chromene compound which has a sulfur-containing substitute represented by the formula (2) in the carbon atom at position 6 and / or position 7 of an indene structure (2,1-f ) naphthol (1,2-b) pyran. This chromene compound has excellent photochromic characteristics, while exhibiting excellent stability at high temperatures. (In the formula, the X ring represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring; each of R3 and R4 represents an alkyl group, or a heterocyclic ring group that contains a ring atom nitrogen atom and binds to the ring X, to which the ring atom nitrogen atom binds, through the nitrogen atom; it already represents an integer from 0-4). |