Process for preparing oligomers of hexafluoropropene
AssigneeCentral Glass Company, Limited
InventorsMasahiro Ozawa, Tadaaki Komatsu, Kimiaki Matsuoka
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Abstract
Oligomers of hexafluoropropene are prepared by oligomerization of hexafluoropropene in an organic solvent in the presence of a halide compound and a crown ether. The selectivity to the dimer or trimer may vary depending on the kind of solvent. For example, the oligomerization of hexafluoropropene in acetonitrile or methylene chloride in the vicinity of room temperature gives the dimer thereof at high selectivity. Use of N,N-dimethylformamide favors the formation of the trimer at high selectivity.
Claims19
A process for preparing oligomers of hexafluoropropene comprising subjecting hexafluoropropene to an oligomerization reaction in the presence of an alkali metal halide and a crown ether at a reaction temperature of about from -20.degree. C. to 200.degree. C., said oligomerization reaction being carried out in an organic solvent which is inert under the oligomerization reaction conditions, said alkali metal halide being present in an amount greater than 0.001 mol per liter of said organic solvent and said crown ether being present in an amount greater than 1/50 time that of said alkali metal halide on a mol basis.
A process for preparing a dimer of hexafluoropropene comprising subjecting hexafluorpropene to an oligomerization reaction in a solvent selected from the group consisting of acetonitrile and methylene chloride in the presence of an alkali metal halide elected from the group consisting of potassium fluoride, cesium fluoride, and potassium chloride and a crown ether in the vicinity of room temperature, said alkali metal halide being present in an amount greater than 0.001 mol per liter of said solvent and said crown ether being present in an amount greater than 1/50 time that of said alkali metal halide on a mol basis.
A process for preparing a trimer of hexafluoropropene comprising subjecting hexafluoropropene to an oligomerization reaction in N,N'-dimethylformamide -dimethylformamide in the presence of an alkali metal halide selected from the group consisting of potassium fluoride, cesium fluoride, and potassium chloride and a crown ether at a temperature of about 90.degree. C., said alkali metal halide being present in an amount greater than 0.001 mol per liter of said N,N'-dimethylformamide -dimethylformamide and said crown ether being present in an amount greater than 1/50 time that of said alkali metal halide on a mol basis.
The process according to claim 22, wherein the solvent is methylene chloride.
Dependencies are inferred from the claim text.