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The olefins C4Fa-1, C4Fs-2 (mixture of cis and trans isomers) and i-C1Fs have been prepared by pyrolytic reactions and a Perfluoroisobutene differs markedly in its physical and chemical i-CdF8 reacts with alcohols and bromine at much number of physical and chemical properties determined. properties from the other isomers, which are quite similar to one another. different rates than does C4Fa-1 or C1Fs-2; an attempt has been made to explain these differences.

method would be expected to depend primarily on the efficiency of the fractionating column. Precaution.-Liquid anhydrous hydrogen fluoride produces severe burns on contact with the skin. Proper protective measures should be employed in handling this material.Acknowledgment.-The samples of pure siloxanes and other silicones were made available for this research through the kindness of the Silicone Division, of the General Electric Co. and the Dow-Corning Company. The research was part of a project sponsored by the Office of Naval Research, U. S. Navy. SummaryMethyl silicones, and other re-alkyl silicones were found to be rapidly and completely converted to their equivalent alkylfluorosilanes by reaction with liquid, anhydrous hydrogen fluoride in the presence of anhydrous copper sulfate at atmospheric pressure. The reaction was developed into an analytical method for determining the silicone content and functional composition of methyl silicone products. The gaseous methyl fluorosilanes are first contacted with Drierite granules, to remove moisture, and then with sodium fluoride pellets, to remove residual hydrogen fluoride. Finally, the gases are condensed and separated into pure methylfluorosilane components by quantitative fractional distillation.

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