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:
Feb. 27, 1990
Filed:
Mar. 08, 1988
Hans-Jerg Kleiner, Kronberg/Taunus, DE;
Hoechst Akteingesellschaft, Frankfurt am Main, DE;
Abstract
The invention relates to compounds of the general formula ##STR1## in which R.sup.1 represents Hal or C.sub.1 -C.sub.3 -alkyl and Hal reprsents a halogen having an atomic weight of 35 to 80. The invention also relates to a process for the preparation of such compounds by reacting a compound of the general formula II ##STR2## in which R.sup.2 represents C.sub.1 -C.sub.3 -alkyl or OR.sup.3 and R.sup.3 represents C.sub.1 -C.sub.8 -alkyl, preferably C.sub.1 -C.sub.3 alkyl, with an acid chloride of the formula MHaL.sub.2 (III), in which M represents SO, CO or PHal.sub.3 and Hal represents a halogen having an atomic weight from 35 to 80, and in which the reaction, if M is Co, is carried out in the presence of a catalyst which is customary for the phosgenation of diesters of phosphonic acid. Finally the invention relates to alkyl esters of cyanomethyl-methylphosphinic acid, i.e. to products of the formula II in which R.sup.2 is a methyl group and R.sup.3 is an alkyl group of 1 to 6 carbon atoms.