Method for synthesizing spiro-oxazines
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United States of America Patent
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Nov 15, 1988
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N/A
app pub date -
Sep 26, 1986
filing date -
Sep 26, 1986
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Expired
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Abstract
Photochromic spiro-oxizine compounds are prepared by mixing in a substantially non-reactive organic solvent medium an alkylidene heterocyclic compound or halide salt thereof, e.g., an indoline, with a metal chelate of an ortho-hydroxynitrosoaromatic compound.
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