Importance

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Abstract

A naphthopyran compound represented by the formula: ##STR1## wherein R.sub.5, R.sub.6, R.sub.8, R.sub.9, and R.sub.10 are each selected from hydrogen, a first stable organic radical, an organic heterocyclic group, halogen, a first nitrogen-substituted group, and a first nitrogen-substituted ring compound; A and B are each selected from hydrogen, substituted phenyl, and substituted naphthyl, provided that at least one of A or B is substituted phenyl or substituted naphthyl; and any substituent of any substituted phenyl or substituted naphthyl at A or B is selected from hydrogen, a second stable organic radical, an organic heterocyclic group, halogen, a second nitrogen-substituted group, and a second nitrogen-substituted ring compound, provided that at least one substituent of any substituted phenyl or substituted naphthyl at either A or B is phenyl, naphthyl, or furyl.

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First Claim