Patent ID: 7342060
Filing Date: 2008-03-11
Classification: C07F

Abstract:
1. A method for synthesizing pentaerythritol diphosphites comprising the steps of: (a) transesterifying pentaerythritol of formula (I) with a monophosphite of formula P—(OR 1 ) 3 to form a first reaction mixture which comprises an intermediate pentaerythritol diphosphite having a spiro isomer as shown in the following formula (III), a caged isomer shown in the following formula (IV), unreacted monophosphite and side reaction products wherein R 1 is selected from the group consisting of straight-chain or branched C 1-20 alkyl groups, C 5-7 cycloaliphatic groups, straight-chain or branched C 2-30 alkenyl groups, C 6-18 aryl groups, C 7-40 alkylaryl groups and C 7-40 arylalkyl groups; (b) removing reaction products by distillation other than said intermediate pentaerythritol diphosphite from said first reaction mixture; and (c) transesterifying said intermediate pentaerythritol diphosphite with an alcohol selected from the group consisting of C where R 2 is selected from the group consisting of C 8-22 alkyls, C 8-22 alkenyls, phenyl, C 7-40 alkylaryls and C 7-40 arylalkyls.