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:
Nov. 17, 1992
Filed:
Nov. 08, 1991
Applicant:
Inventors:
Alexander P Fung, Martinez, CA (US);
M Moklesur Rahman, Antioch, CA (US);
Thomas J Dietsche, Berkeley, CA (US);
Assignee:
DowElanco, Indianapolis, IN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
546 13 ; 546-2 ; 546-3 ; 546-8 ; 546-9 ; 546 22 ; 558411 ; 564161 ; 564162 ; 568774 ; 568775 ;
Abstract
Chloro and bromophenols and N-acylanilines are fluorinated in an ortho or para position with an N-fluoropyridinium salt to obtain fluorohalophenols and N-acylfluorohaloanilines, which can be further converted to fluorophenols and N-acylfluoroanilines by reduction. Thus, o-fluorophenol is obtained by fluorination of p-bromophenol with 2-chloro-6-(trichloromethyl)pyridinium fluoroborate and reduction of the product obtained with sodium formate and a palladium catalyst. N-Fluoropyridinium salts having trichloromethyl substituents are disclosed.