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US 4,287,124 AGranted
Process for the preparation of 4,5-perfluoro-1,3-dioxalanes
AssigneeHoechst Aktiengesellschaft
InventorsGunter Siegemund, Herbert Muffler
Life of this patent
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Abstract
4,5-Perfluoro-1,3-dioxolanes prepared by the described process have an anesthetic effect.
Claims5
A process for the manufacture of 4,5-perfluoro-1,3-dioxolanes of the formula ##STR12## in which X and Y, independent of one another, are fluorine or trifluoromethyl and R.sup.1 and R.sup.2 are hydrogen or methyl, which comprises reacting a 2-(.alpha.-chloroalkoxy)-perfluorocarboxylic acid halide of the formula
- R.sup.1 R.sup.2 CCl--O--CXY--COZ
- in which X, Y, R.sup.1 and R.sup.2 are as defined above and Z is chlorine or fluorine, with a fluoride selected from the group consisting of potassium fluoride, cesium fluoride, ammonium fluoride and alkylammonium fluoride, under anhydrous conditions, the reaction being conducted at a temperature in the range of from 0.degree. to 120.degree. C.
Dependencies are inferred from the claim text.