Heterocyclic chromenes and their use in ophthalmic optics.

摘要

The invention relates to photochromic compounds of general formula: <IMAGE> in which R<a>, R<b> and R<c> denote hydrogen; alkyl; aryl; OR, SR, COR or COOR, in which R denotes hydrogen, alkyl or aryl; amino of formula NR1R2 in which R1 and R2 denote hydrogen, alkyl, cycloalkyl, or aryl, R1 and R2 being able to form, with the nitrogen atom, a heterocycle containing 4 to 7 members and being able additionally to contain one or more heteroatoms chosen from nitrogen, oxygen or sulphur; a halogen atom; a mono- or polyhaloalkyl group; an NO2, CN or SCN group; n and m denote integers from 1 to 5 according to the number of substitutions on the ring and p can be equal to 1 or 2 depending on the number of substitutions on the ring; H is an aromatic heterocycle having 4 to 7 members containing one or more heteroatoms chosen from nitrogen, oxygen or sulphur, it being possible for these heterocyclic rings to be substituted by one or more alkyl, alkoxy, amino, aryl or aralkyl groups or condensed with an aromatic ring, and to their use in ophthalmic optics.s