H-ANNELLATED BENZO[F]CHROMENES

摘要

The present invention relates to specific photochromic h-annellated benzo[f]chromene derivatives and their use in plastics of all types, especially for ophthalmic applications. In. particular, the present invention relates t o photochromic compounds derived from benzo[f]chromenes, which in the open form have especially long-wave absorption maxima making it possible to obtain violet to blue tints when used in phototropic glasses.