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:
Jan. 04, 1977
Filed:
Apr. 25, 1975
Applicant:
Inventors:
Hans-Jerg Kleiner, Bad Soden, Taunus, DT;
Walter Rupp, Schneidhain, Taunus, DT;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
260970 ; 2041 / ;
Abstract
A process for the preparation of ethane-1,2,-diphosphinic acid diesters of the formula ##STR1## where R.sub.1 represents alkyl, phenyl and/or phenalkyl groups having from 1 to 18 carbon atoms and R.sub.2 alkyl groups having from 1 to 18 carbon atoms, which may be optionally substituted by halogen atoms, which comprises reacting phosphonous acid esters of the formula ##STR2## where R.sub.1 and R.sub.2 are as define above, with acetylene in the presence of catalytic amounts of radical-forming agents and/or with UV irradiation.