The conversion of perfluoro-olefins, perfluoroketones or perfluoroacids into perfluoroethers, perfluoroalkylperoxides or perfluorocarbons
作者:R.N. Haszeldine
DOI:10.1016/s0022-1139(00)83241-8
日期:1985.8
Part of a study to synthesise via radical reactions perfluoroalkanes containing oxygen is illustrated with the olefin (CF3)2C:C(CF3)2. Photochemical oxidation of the olefin with short reaction time gives the ketones CF3.CO.CF(CF3)2 (48% yield), CF3.O.CF2.CO.CF3, CF3.O.CF2.CO.CF(CF3)2 and CF3.CO.CF3. The epoxide is a by-product not an intermediate in these reactions.
Fluorination of Chlorinated Trifluoromethyl Ethers
作者:Akira Sekiya、Kunimasa Ueda
DOI:10.1246/cl.1991.1421
日期:1991.8
Chlorine atoms in the chlorinated trifluoromethyl ether prepared from the reaction between chlorinated ethylenes and trifluoromethyl hypofluorite were fluorinated directly by fluorine gas. Tin(II) fluoride/sodiumfluoride system was effective in the fluorination.
Vanadiumpentafluoride reacts with polyfluorinated and polychlorinated olefins, alkadienes, cycloalkenes and cyclodienes in CFCl3 or without a solvent at −25° to 100°C, forming products of addition of two fluorine atoms across the CC bond.
Compositions of a hydrofluoroether and a hydrofluorocarbon
申请人:Klug Diana Lynn
公开号:US06905630B2
公开(公告)日:2005-06-14
This invention relates to compositions that include at least one fluoroether and at least one hydrofluorocarbon. Included in this invention are compositions of a cyclic or acyclic hydrofluoroether of the formula C
a
F
b
H
2a+2−b
O
c
wherein a=2 or 3 and 3≦b≦8 and c=1 or 2 and a hydrofluorocarbon of the formula C
n
F
m
H
2n+2−m
wherein 1≦n≦4 and 1≦m≦8. Such compositions may be used as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, and displacement drying agents.
Practical preparation of potentially anesthetic fluorinated ethyl methyl ethers by means of bromine trifluoride and other methods
作者:Tomas Hudlicky、Caiming Duan、Josephine W Reed、Fengyang Yan、Milos Hudlicky、Mary Ann Endoma、Edmond I Eger
DOI:10.1016/s0022-1139(99)00302-4
日期:2000.3
Synthetic methods, especially those that use brominetrifluoride as a fluorinating agent, are described for the preparation of a number of fluorinated ethyl methyl ethers in good yield and high purity. In all cases, medium-scale syntheses (8–22 g) of potentially anesthetic compounds have been accomplished. The compounds are of sufficient purity (>99%) for biological evaluation.