| abstract |
The invention concerns photochromic compounds with formula (I), in which R1 is an asymmetric aliphatic monocyclic group with formula (II), where 1 = 1-12, and R9 is H or an alkyl, alkoxy, dialkylamino, alkyl ester or CN group with the condition that at least one of the R9 groups is not H, R2-R7 can have a variety of meanings, A represents a (hetero)aromatic ring which can be substituted and n is a whole number. Application to the production of photochromic articles made of organic polymer, notably lenses. |