Preparation of perfluoroolefines

Details Preparation of perfluoroolefines Preparation of perfluoroolefines

1975-04-25

1977-04-05

Horwitz, D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 1726, C07C 1908

Patent

active

040162176

ABSTRACT:
A process for making branched, internally-unsaturated liquid perfluoroolefins that are oligomers of tetrafluoroethylene and have an empirical formula (C.sub.2 F.sub.4).sub.n where n is an integer of 4 to 7, comprising contacting tetrafluoroethylene under anhydrous conditions with at least one fluoride which is a source of fluoride ions, said fluoride being selected from the group consisting of the normal fluorides, acid fluorides and fluorosulphinates of the metals potassium, rubidium and caesium and normal fluorides of a tetraalkylammonium ion, at a temperature of 20.degree. C to 170.degree. C in the presence of an inert solvent selected from the group consisting of dimethylformamide, dimethyl sulphoxide, N-methyl pyrrolidone and hexamethylphosphoramide, and recovering said branched, internally-unsaturated liquid perfluoroolefins from the reaction medium.

REFERENCES:
patent: 2918501 (1959-12-01), Brehm et al.
patent: 3083238 (1963-03-01), Hauptschein et al.
patent: 3403191 (1968-09-01), Graham
Graham, J. Org. Chem. 31, pp. 955-957 (1966).

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