Production of tertiary phosphine oxides

US3997611A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Bernd Lippsmeier
• Klaus Hestermann · Lechenich, DE
• Hubert Neumaier

Key dates

• Filing date: Mar 26, 1975
• Grant date: Dec 14, 1976
• Expiry date: Mar 26, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/53
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Production of tertiary phosphine oxides of the general formula (I): ##STR1## in which the substituents R.sub.1 and R.sub.2, being identical or different, each stand for an alkyl, alkenyl, alkinyl, cycloalkyl, aralkyl or aryl radical having from 1 to 18 carbon atoms. The phosphine oxides are made by splitting off formaldehyde and hydrogen halide at temperatures within the range about 150.degree. and 350.degree. C, in the presence of hydrogen halide, from a molten compound of the general formula (II): ##STR2## in which R.sub.1 and R.sub.2 have the meanings given above and X stands for halogen; separating the formaldehyde and hydrogen split off from the reaction mixture, and treating the resulting crude product so as to separate the compound of general formula (I) therefrom.