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:
Oct. 04, 1977
Filed:
Mar. 26, 1976
Manfred Finke, Fischbach, Taunus, DT;
Hans-Jerg Kleiner, Kronberg, Taunus, DT;
Hoechst Aktiengesellschaft, Frankfurt am Main, DT;
Abstract
Process for preparing cyclic phosphinic acid esters of the formula (I) ##STR1## wherein R.sub.1 is an alkyl radical having up to 18 carbon atoms or a phenyl radical being optionally substituted by alkyl, halogen or alkylated amino groups, R.sub.2 stands for a hydrogen atom or has the same meaning as R.sub.1 and n is 1 or 2, which comprises reacting phosphinic acid monoesters of the formula (II) ##STR2## wherein R.sub.3 is an alkyl radical having up to 8 carbon atoms optionally substituted by chlorine atoms and R.sub.1 has the meaning given above, with an alkenol of the formula (III) ##STR3## wherein R.sub.2 and n have the aforesaid meaning, in the presence of catalytic quantities of free radical forming agents, splitting off the alcohol of formula (IV)