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. 12, 1985
Filed:
Jun. 28, 1982
Applicant:
Inventor:
Michel Desbois, Rillieux, FR;
Assignee:
Rhone-Poulenc Specialites Chimiques, Courbevoie, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568 29 ; 2604 / ; 2604 / ; 562429 ; 568 30 ; 568 31 ; 568 33 ;
Abstract
A process for the preparation of .alpha.,.alpha.-difluoroalkoxy or .alpha.,.alpha.-difluoroalkylthiophenyl sulfones, in which a polyhaloalkoxybenzene or a polyhaloalkylthiobenzene is reacted with a sulfonic acid, a derivative or a precursor of this acid, in the presence of boron trifluoride in an amount such that the absolute pressure of the boron trifluoride within the reaction vessel exceeds 1 bar, and in the presence of hydrofluoric acid as a solvent. The resultant products are useful as intermediates in the synthesis of compounds having a phytosanitary (e.g., herbicidal) or pharmaceutical activity.