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US 4,231,849 AGranted
Process for the preparation of a perfluorinated cyclic ether
AssigneeImperial Chemical Industries PLC
InventorsJohn Hutchinson, Graham Whittaker
Life of this patent
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Abstract
An inert fluid of high chemical stability which comprises a perfluorinated cyclic ether having the formula C.sub.10 F.sub.20 O, and its preparation by perfluorination of the corresponding ethylenically-unsaturated cyclic ether C.sub.10 F.sub.18 O with cobalt trifluoride, electrochemically or with fluorine gas.
Claims6
A process for the preparation of a perfluorinated cyclic ether which comprises:
- (a) subjecting the pentamer of tetrafluoroethylene to a single step process of hydrolysis and cyclisation by adding a tertiary nitrogen base to a dispersion of the pentamer and a polar aprotic organic solvent in water at a temperature of from 0.degree. C. to 50.degree. C. to obtain the C.sub.10 F.sub.18 O ether of formula ##STR8## (b) perfluorinating the ether obtained in step (a) to obtain a perfluorinated cyclic C.sub.10 F.sub.20 O ether having the formula:
- ##STR9##
Dependencies are inferred from the claim text.