Process for the preparation 6-chloro-2,4,8,10-tetra-butyldibenzo[d,f][1,3,2]dioxaphoshepin

U.S. Patent Number: 5391799

Abstract: 6-Chloro-2,4,8,10-tetrabutyl-dibenzo[d,f][1,3,2]dioxaphosphepin and related phosphorochlorites are prepared by reaction of an appropriate bisphenol with phosphorus trichloride in the presence of a catalytic amount of 1-methyl-2-pyrrolidinone in toluene followed by heating the solution and stripping off the hydrogen chloride formed by a flow of nitrogen.

Inventors: Pastor; Stephen D. (Danbury, CT), Shum; Sai P. (Pleasantville, NY)

Assignee: Ciba-Geigy Corporation (Ardsley, NY)

Application Number: 08/220,982

Issued: 1995-02-21

Expired: 2007-02-21

Classes: 558/96 ; 558/73

Field of search: 558/96,101

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