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. 01, 1994
Filed:
Apr. 15, 1993
Applicant:
Inventors:
Leonid A Rozov, Fair Lawn, NJ (US);
Chialang Huang, Edison, NJ (US);
Donald F Halpern, Fanwood, NJ (US);
Gerald G Vernice, Nutley, NJ (US);
Assignee:
Anaquest, Inc., Liberty Corner, NJ (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568683 ;
Abstract
A process for the preparation of highly purified optical isomers of desflurane, i.e. 2-(difluoromethoxy)-1,1,1,2-tetrafluoroethane, is described wherein the highly purified opposite optical isomer of iso-flurane is reacted with bromine trifluoride in the cold, preferably in the presence of a solvent. A preferred solvent is bromine. The highly purified positive isomer of desflurane is advantageous over the negative isomer or the racemate.