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. 26, 1985
Filed:
Mar. 04, 1983
Werner Pieper, Erftstadt, DE;
Werner Krause, Hurth-Knapsack, DE;
Hoechst Aktiengesellschaft, , DE;
Abstract
The disclosure relates to a process for making derivatives of vinylpyrophosphonic acid, wherein a ketone is reacted with tetraphosphorus hexoxide (P.sub.4 O.sub.6) in the presence of a catalytically active proportion of a proton-yielding substance at elevated temperature. Vinylphosphonic acid derivatives are obtained by hydrolyzing the vinylpyrophosphonic acid derivatives with an equivalent proportion of water. More particularly, the ketone used is a compound of the following general formula ##STR1## in which either R stands exclusively for a halogen and R' either stands for a halogen or hydrogen, a halogen-substituted or unsubstituted alkyl, aryl, alkaryl or aralkyl group having from 1 to 18 carbon atoms, and R' stands for an alkyl, aryl, alkaryl, aralkyl or alkenyl group having from 1 to 18 carbon atoms, or R' stands exclusively for an alkenyl group having from 2 to 18 carbon atoms and R and R' being identical or different each stand for hydrogen or a halogen or a halogen-substituted or unsubstituted alkyl, aryl, alkaryl or aralkyl group having from 1 to 18 carbon atoms.