Photochromic benzopyran compounds

Details Photochromic benzopyran compounds Photochromic benzopyran compounds

1997-07-17

1999-02-09

Richter, Johann

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

252586, 544378, 546214, 549383, 549414, 549460, C07D31194, C07D40510, C07D40710, G02B 523

Patent

active

058696628

ABSTRACT:
Benzopyran compounds represented by the formulas: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, and R.sub.10 are selected from hydrogen, a stable organic radical, a heterocyclic group, halogen, a nitrogen-substituted group, and a nitrogen-substituted ring compound.

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