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The fluorination of hydrocarbons in the vapour phase by the use of cobalt trifluoride is readily achieved, and, when controlled conditions of reaction are employed, good yields of fluorocarbon products are obtained. An apparatus for carrying out this type of reaction, and also a convenient cell for the generation of fluorine are described. The syntheses of some of the hydrocarbon starting‐materials are given.

Developmentof practicable synthetic routes to a vast new range of highly fluorinated cyclic compounds has turned industrial attention to their potential application, Current studies directed by development of new knowledge concerning synthetic routes to the basic fluorocarbon building blocks, the substitution chemistry of fluoroaromatic ring systems, and the end-use patterns for these compounds raise hopes for their industrial use.

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