The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1982
Filed:
Sep. 08, 1980
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
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.