Method for preparing arylphosphonite antioxidant
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United States of America Patent
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Jun 19, 2007
Grant Date -
Aug 25, 2005
app pub date -
Nov 9, 2004
filing date -
Feb 19, 2004
priority date (Note) -
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Abstract
A method for preparing an arylphosphonite antioxidant of the formula (I) below is disclosed, ##STR00001## wherein Ar is ##STR00002## First, the reactants 2-phenylphenol and phosphorus trichloride are heated under the existence of a zinc chloride catalyst for producing 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorin (CDOP) of the formula (II) below: ##STR00003## Next, the excess phosphorus trichloride is removed. Finally, an organic solution of a di-hydroxylphenol compound of the formula (III), Ar--(OH).sub.2 (III) wherein Ar is defined as the above, is heated with the CDOP of formula (II) to form the product of the formula (I).
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