7-methylidene-5-oxo-furo fused naphthopyrans
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United States of America Patent
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Sep 22, 1998
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Oct 23, 1997
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Oct 23, 1997
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Abstract
Described are novel 7-methylidene-5-oxo-furo fused naphthopyran compounds having certain substituents at the 2 position of the pyran ring. Also described are polymeric organic host materials that contain or that are coated with such compounds.
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