Described are a series of novel photochromic benzopyran and naphthopyran compounds in which two cyclopropyl groups are appended at the 2-position of the benzopyran or naphthopyran ring. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic or plano lenses that incorporate the noval pyran compounds or combinations of the novel pyran compounds with other complementary photochromic compounds are described. ##STR1##
本文介绍了一系列新型光致变色苯并
吡喃和
萘并
吡喃化合物,其中在苯并
吡喃或
萘并
吡喃环的2位上附有两个环丙基基团。本文还介绍了含有这种化合物或被这种化合物涂覆的有机宿主材料。本文还描述了包含新型
吡喃化合物或新型
吡喃化合物与其他互补光致变色化合物组合的眼科或平面镜片等物品。 ##STR1##