Production of 2-chloroformylethylmethylphosphinic acid chlorides

US4318865A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Alexander Ohorodnik · Lechenich, DE
• Hubert Neumaier
• Klaus Gehrmann · Lechenich, DE

Key dates

• Filing date: Sep 8, 1980
• Grant date: Mar 9, 1982
• Expiry date: Sep 8, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/34
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for making 2-chloroformylethylmethylphosphinic acid chlorides of the general formula: ##STR1## in which R.sup.1 and R.sup.2 each stand for hydrogen or CH.sub.3. To this end, methyldichlorophosphane is reacted with acrylic acid, methacrylic acid or crotonic acid at elevated temperature. More particularly, a solution of methyldichlorophosphane in phosphorus trichloride, the solution originating from a reaction of phosphorus trichloride with methane at temperature higher than 500.degree. C., is used. The reaction is effected at temperatures ithin the range 50.degree. to 90.degree. C. in the presence of hydrogen chloride; and the phosphorus trichloride is distilled off.