Photochromic products and method for their preparation

Details Photochromic products and method for their preparation Photochromic products and method for their preparation

1994-06-02

1996-08-06

Tsang, Cecilia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

544 71, 544150, 544375, 546153, 546155, 546156, 546196, 5462827, 548409, 548525, 524 99, 524110, 252586, 549 60, C07D31192, C07D40900, C07D26500, C07D40500

Patent

active

055435335

ABSTRACT:
Photochromic products belonging to the group of chromenes having general formula (I): ##STR1##

REFERENCES:
patent: 4818096 (1989-04-01), Heller et al.
patent: 5238981 (1993-08-01), Knowles
patent: 5244602 (1993-09-01), Van Gemert

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