| 摘要 |
The invention relates to novel naphthopyran-type compounds, which are annelated in position C5-C6 with a seven-membered carbocycle, and which are of formula (I) given below:These compounds (I) possess interesting photochromic properties. The invention also relates to their preparation, their applications as photochromes as well as the compositions and (co)polymer matrices containing them. |
