Photochromic spironaphthopyran compounds

Details Photochromic spironaphthopyran compounds Photochromic spironaphthopyran compounds

1995-06-07

1997-10-21

Chan, Nicky

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549 26, 544 6, C07D30932, C07D33514

Patent

active

056798059

ABSTRACT:
A naphthopyran compound represented by the formula: ##STR1## wherein A and B are each selected from the following group: a substituted divalent cyclic radical, a substituted divalent aromatic radical, and a substituted divalent fused heterocyclic radical.

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