Purified sulfonated organophosphorus compounds and catalysis of organic reactions therewith
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United States of America Patent
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Sep 2, 2003
Grant Date -
Feb 7, 2002
app pub date -
Jun 25, 2001
filing date -
Dec 23, 1998
priority date (Note) -
Expired
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Abstract
Water-soluble sulfonated organophosphorus compounds are purified by at least partially removing contaminating sulfite values therefrom, by decreasing the pH of a solution of such sulfonated organophosphorus compounds to a value of less than or equal to 4, and maintaining the pH of the solution at this value of 4 or less for such period of time as to reduce the weight concentration of sulfite in the solution to less than 100 ppm; the organophosphorus compounds thus purified are well suited for the two-phase cocatalysis of a wide variety of organic reactions.
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