Anthony Pope Wright

Synthesis of fluorinated telomers. Part 4. Telomerization of vinylidene fluoride with commercially available α,ω-diiodoperfluoroalkanes

Abstract The synthesis of a new fluorinated αω-diiodo telomer I[(TFE)(VDF),]I (A), where TFE and VDF represent tetrafluoroethylene and vinylidene fluoride respectively, has been carried out by telomerization of VDF with αω-diiodoperfluoroalkanes. The thermal telomerization of VDF with 1,2-diiodoperfluoroethane IC2 F4I led to good yields of the monoadduct IC2F4CH2CF2I and of the diadduct which was composed of an almost equimolar ratio of ICF2CH2C2F4CH2CF2I and IC2F4(CH2CF2)2I, together with a small amount of IC2F4CH2CF2CF2CH2I and a triadduct containing I (VDF) C2F4(VDF)2I and IC2F4(VDF)3. This procedure has been applied successfully to αω-diiodo-n-perfluorobutane and α,ω-diiodo-n-perfluorohexane. The reactivity of VDF relative to the fluorinated α,ω-diiodo telogens has been studied from which it is shown that the environment of the terminal group of the telogen is a major factor affecting the reactivity.

The role of boron trichloride in the synthesis of phenyltrichlorosilane from benzene and trichlorosilane

Benzene and trichlorosilane form phenyltrichlorosilane and hydrogen. Boron trichloride has long been used as the preferred catalyst for this process. The mechanism of catalysis is indicated as follows: BCl3 + xHSiCl3 → HxBCl3−x + xSiCl4; HxBCl3−x + xC6H6 → (C6H5)x + xH2; (C6H5)xBCl3−x + xHSiCl3 → HxBCl3−x + xC6H5SiCl3.