Method for purifying 4-(nitrooxy)butyl(2S)-2-(6-methoxy-2-naphthyl) propanoate
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United States of America Patent
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Dec 11, 2012
Grant Date -
Oct 7, 2010
app pub date -
Jun 18, 2009
filing date -
Jun 20, 2008
priority date (Note) -
Expired
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Abstract
The present invention relates to a method for purifying naproxcinod comprising the steps of:
- a) dissolving or dispersing a mixture containing naproxcinod in an amount higher than 90% by weight in a solvent;b) cooling the solution or two phases dispersion under stirring to a temperature ranging from −20° C. to 10° C.c) optionally seeding the solution with crystals of naproxcinodd) stirring, by maintaining the temperature in the range from −40° C. to 10° C.e) collecting the formed solid by maintaining the temperature under 15° C.
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