Patent · US Expired

Process for the preparation of cyclic phosphites

US4692540A · kind A · utility

4Cited by

4References

9Claims

0Family size

Assignee

Ciba-Geigy · US

Inventors

Hugo Illy · Reinach, CH
Bjorn Schliebs · Lindenfels, DE
Wilhelm Hess · Lindlar, DE

Key dates

Filing date	Apr 15, 1985
Grant date	Sep 8, 1987
Priority date	—
Expiry date	Apr 15, 2005

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07F9/65746
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a process for the preparation of pentaerythritol esters of phosphorous acid derivatives by reacting pentaerythritol with a phosphorous trihalide and a phenol in the presence of a quaternary salt or a polyether. The use of such catalysts is not only able to improve the yield, but also makes it possible for the entire process to be carried out in one step by adding the phenol at the start of the reaction of pentaerythritol with the phosphorous halide.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.