Photochromic spiropyran compounds

Details Photochromic spiropyran compounds Photochromic spiropyran compounds

C - Chemistry, Metallurgy

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C07D 311/58 (2006.01) C07D 311/70 (2006.01) C07D 311/92 (2006.01) C08K 5/1545 (2006.01) G02C 7/10 (2006.01) G02F 1/01 (2006.01)

Patent

CA 2007006

ABSTRACT OF THE DISCLOSURE 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 novel pyran compounds or combinations of the novel pyran compounds with other complementary photochromic compounds are described.

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