Central Glass Company, Limited

Tadaaki Komatsu

Kimiaki Matsuoka

Masahiro Ozawa

Minoru Aramaki

Hideki Oshio

Fumio Inoue

Hirokazu Takeda

Derivatives of hexafluoropropene dimer expressed by the following general formula ##STR1## in which R.sub.f represents (CF.sub.3).sub.2 C.dbd.C(CF.sub.2 CF.sub.3) or (CF.sub.3).sub.2 CH--CF(CF.sub.2 CF.sub.3) and R represents a hydrocarbon residue of a carboxylic acid having one free site capable of reacting with the dimer. A process for preparing the derivatives is also disclosed in which the dimer is contacted with the carboxylic acid in an inert solvent in the presence of a catalyst. Metal, amine or ammonium salts of the acid may be also used for the reaction, in which case the reaction is feasible in the absence of a catalyst.

Novel derivatives of hexafluoropropene dimer and process for preparing

A process for preparing fluorine-rich organic compounds containing one or two carbon atoms from organic fluoro compounds of lower fluorine content in which starting partially or completely halogenated fluoro carbon compounds having at least one halogen atom other than fluorine, e.g., CHCl.sub.2 F, CHClF.sub.2, CCl.sub.2 F.sub.2, CCl.sub.3 F, C.sub.2 Cl.sub.3 F.sub.3, C.sub.2 Cl.sub.2 F.sub.4 and C.sub.2 Cl.sub.4 F.sub.2, are contacted under disproportionation conditions with a catalyst system of a specific type which comprises 0.1 - 5% by weight, as metal, of a nickel(II) halide, titanium(III) chloride or titanium(III) fluoride and a balance of an aluminum compound such as activated alumina, silica, alumina or aluminum fluoride.

Process for the preparation of fluorine-rich organic compounds

Oligomers of tetrafluoroethylene are prepared by oligomerization of tetrafluoroethylene in an organic solvent in the presence of a fluoride compound and a crown ether. The catalytic action of the fluoride compound can be far improved when the fluoride compound is used together with a crown ether.

Process for preparing oligomers of tetrafluoroethylene

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.

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Saitama, Japan

Tadaaki Komatsu