Photochromic compounds

Details Photochromic compounds Photochromic compounds

C - Chemistry, Metallurgy

07

D

31/162, 260/244.

C07D 498/10 (2006.01) G02B 5/23 (2006.01) G02C 7/02 (2006.01)

Patent

CA 1111424

Abstract of the Disclosure Photochromic compounds of the formula Image wherein one of R1 and R2 is halogen or lower alkoxy, and the other is hydrogen, and R3 and R4 are hydroyen, lower alkyl, lower alkoxy, or halogen and their use in lenses are disclosed.

331705

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