| abstract |
The invention concerns photochromic compounds with the following Formula: ##STR1## in which: R 1 is a asymmetric aliphatic monocyclic group with the Formula, ##STR2## where l=1-12, and R 9 is H or an alkyl, alkoxy, dialkylamino, alkyl ester or CN group with the condition that at least one of the R 9 groups is not H, n R 2 -R 7 can have a variety of meanings, A represents a (hetero)aromatic ring which can be substituted and n is a whole number. n Application to the production of photochromic articles made of organic polymer, notably lenses. |