ピラン酸素に隣接し両方のメタ位によってパラ置換基に結合されたベンゼン環を有する、フォトクロミック縮合ナフトピラン

摘要

The present invention relates to photochromic fused naphthopyrans having a benzene ring which is adjacent to the pyran oxygen and is linked to the para substituent via both meta positions, and to the use thereof in plastics of all types, in particular for ophthalmic purposes.