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:
Jun. 27, 1989
Filed:
Jan. 05, 1988
Applicant:
Inventors:
Viktors Jansons, Los Gatos, CA (US);
Heinrich C Gors, Mountain View, CA (US);
Assignee:
Raychem Corporation, Menlo Park, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568322 ; 568319 ;
Abstract
A method of preparing 4,4'-diphenoxybenzophenone, comprising reacting diphenyl ether and carbon dioxide in the presence of a Friedel-Crafts catalyst and a promoting agent, preferably selected from the group consisting of phosphoryl chloride, phosphorus pentoxide, tetrachlorosilane, methyltrichlorosilane, dimethyldichlorosilane, titanium tetrachloride, zirconium tetrachloride, zirconium oxyhalide, and phosphorus pentachloride. In a preferred embodiment, the Friedel-Crafts catalyst is aluminum chloride and the promoting agent is phosphoryl chloride.