194039-83-3Relevant articles and documents
Production of fluormethyl 2,2,2-trifluoro-1-(trifluoromethyl)ethyl ether
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Paragraph 0051-0053, (2015/09/28)
A process for removing water from a mixture comprising hydrogen fluoride and water, said process comprising: a) providing a mixture comprising hydrogen fluoride and water; and b) removing water from the mixture as a constant boiling mixture with hydrogen fluoride.
PROCESS FOR THE PREPARATION OF FLUOROMETHYL 2,2,2-TRIFLUORO-1-(TRIFLUOROMETHYL) ETHYL ETHER
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Page/Page column 20-22, (2008/06/13)
The present invention refers to a process for the preparation of fluoromethyl 2,2,2-trifluoro-1-(trifluoromethyl) ethyl ether (sevoflurane) which includes a step that consists of reacting hexafluoroisopropanol with a formaldehyde equivalent selected among paraformaldehyde or 1,3,5-trioxane, a chlorinating agent selected from the group consisting of oxalyl chloride, phosphorus trichloride, phosphorus pentachloride, phosphorus oxychloride, sulfuryl chloride and thionyl chloride, and a strong acid selected from the group consisting of concentrated or fuming sulfuric acid resulting in the formation of the intermediate sevochlorane which is converted to sevoflurane in a second step which consists of reacting sevochlorane with an alkali metal fluoride, or a linear or branched chain tetra-alkyl quarternary ammonium fluoride in the presence of a sub-stoichiometric quantity of an alkali metal iodide, or a linear or branched alkyl chain tetra-alkyl quarternary ammonium iodide, preferably in a solvent.