Photochromic compound

Details Photochromic compound Photochromic compound

1992-11-17

1994-09-20

Richter, Johann

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 89, 252586, C07D31168

Patent

active

053490657

ABSTRACT:
A compound represented by the following general formula (II): ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a phenyl group, a benzyl group, a phenethyl group, an alkylamine group having 1 to 4 carbon atoms, or a dialkylamino group having 2 to 8 carbon atoms, and ##STR2## represents a nobornylidene group or bicyclo [3,3,1]9-nonylidene group which may have a substituent, and ##STR3## represents a pyridine, quinoline, pyrrole or benzothiophene group which may have a substituent.

REFERENCES:
patent: 5028711 (1991-07-01), Stenzel et al.
patent: 5061813 (1991-10-01), Atwal

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