Photochromic benzodioxine fused naphthopyran compounds,...

Details Photochromic benzodioxine fused naphthopyran compounds,... Photochromic benzodioxine fused naphthopyran compounds,...

2005-02-22

2005-02-22

Desai, Rita (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C546S280100, C546S282400, C546S282700, C549S012000, C549S024000, C549S025000, C549S041000, C549S354000, C549S358000

Reexamination Certificate

active

06858732

ABSTRACT:
Benzodioxino-naphtho[1,2-b]pyran compounds having particularly advantageous photochromic properties, such as, high sensitivity/coloration, two distinct absorption bands in the 430-500 nm range and 520-620 nm range of the visible spectrum may be generally described as a naphthopyran having a central nucleus of the formula:wherein F is a 1,4-benzodioxine ringwith its 2,3 positions fused to the i, j, or k faces; and R1and R2are the atoms or groups providing photochromic properties to the naphthopyran.

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