Method for preparing arylphosphonite antioxidant

Details Method for preparing arylphosphonite antioxidant Method for preparing arylphosphonite antioxidant

2007-06-19

2007-06-19

McKane, Joseph K. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

Reexamination Certificate

active

10983620

ABSTRACT:
A method for preparing an arylphosphonite antioxidant of the formula (I) below is disclosed,wherein Ar isFirst, 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:Next, the excess phosphorus trichloride is removed. Finally, an organic solution of a di-hydroxylphenol compound of the formula (III),in-line-formulae description="In-line Formulae" end="lead"?Ar—(OH)2  (III)in-line-formulae description="In-line Formulae" end="tail"?wherein Ar is defined as the above, is heated with the CDOP of formula (II) to form the product of the formula (I).

REFERENCES:
patent: 2004/0204602 (2004-10-01), Lin et al.

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