Photochromic chromene compounds
作者： Harry G. Heller
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摘要: Described are a series of novel photochromic benzopyran and naphthopyran compounds substituted with (1) cyclopropyl group (2) phenyl, or 5-member aromatic heterocyclic at the 2-position ring. Also described organic host materials that contain coated such compounds. Articles as ophthalmic plano lenses incorporate pyran combinations other complementary described.
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