Process for preparing 2,2,3-trifluoropropionyl fluoride
CA 1293739 C · Owner: Kohno, Satoru · Inventors: Negishi, Yoshio; Takaki, Shoji; Ohsaka, Yohnosuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to the preparation of 2,2,3-trifluoropropionyl fluorides which are useful as solvents or as intermediates for synthesis of medicines or solvents. These compounds are prepared by catalytic ring opening of tetrafluorooxetane. The preferred catalysts are alkali metal fluorides (such as sodium fluoride potassium, fluoride or cesium fluoride) or Lewis acids (such as A1C13 or SbF5). The reaction may be carried out either in a liquid phase or in a gaseous phase, preferably at a temperature of 80-200°C.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 31, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 31, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.