Patent ID: 7232922
Filing Date: 2007-06-19
Classification: C07F,C09K

Abstract:
1. A method for preparing an arylphosphonite antioxidant of the following formula (I): wherein Ar is comprising: (a) heating a 2-phenylphenol compound with a phosphorus trichloride compound in the present of a zinc chloride catalyst to obtain a 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorin of the following formula (II): (b) removing the excess phosphorus trichloride; and (c) heating an organic solution of a di-hydroxylphenol of the following formula (III),  wherein Ar is defined the same as the above formula (I), with the 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorin of formula (II) to form the arylphosphonite antioxidant of formula (I).