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. 21, 1995
Filed:
Nov. 08, 1993
Applicant:
Inventor:
John Tomko, Dobbs Ferry, NY (US);
Assignee:
Akzo Nobel N.V., Arnhem, NL;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562-8 ;
Abstract
A process for forming 1-phenylvinyl-1-phosphonic acid utilizes reacting a mixture of phosphorus trihalide, such as phosphorus trichloride, and acetophenone with water, under conditions in which the water is gradually added to the mixture with cooling to form a reaction mixture, which can be sparged of excess acetophenone with aqueous acid while under vacuum, comprising the 1-phenylvinyl-1-phosphonic acid. This product can be recovered from the reaction mixture by recrystallization from aqueous mineral acid, such as hydrochloric acid.