Naphthopyrans annelated in C5-C6 with a dihydrobenzo-cycloheptatriene-type carbocycle and compositions and matrices containing them

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.