Photochromic tetraphenyl naphthodipyrans
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United States of America Patent
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Nov 7, 1995
Grant Date -
N/A
app pub date -
Apr 8, 1994
filing date -
Apr 8, 1994
priority date (Note) -
Expired
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Abstract
Described are novel reversible photochromic naphthopyran compounds which have two phenyl moieties adjacent to each oxygen of each pyran ring. The substituents on each pair of phenyl moieties mirror one another when the phenyl groups are substituted. The naphthodipyrans are prepared from .beta.,.beta.-dihydroxynaphthalene compounds.
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