Process for obtaining bis(2,4-di-tert-butylphenyl) halophosphites

US5210260A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Manfred Bohshar · Kelkheim, DE
• Hans-Jerg Kleiner · Kronberg, DE

Key dates

• Filing date: Jul 6, 1992
• Grant date: May 11, 1993
• Expiry date: Jul 6, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/146
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for obtaining phosphorus acid-bis(2,4-di-tert-butylphenyl) ester halides in which a phosphorus acid-2,4-di-tert-butylphenyl ester dihalide is heated in the presence of a catalyst containing nitrogen or phosphorus, or both, to 130.degree. C. to 280.degree. C. and the phosphorus trihalide produced by disproportionation is removed from the reaction mixture.