The formation of polyhalogenosiloxanes from the insertion reactions of perhalogeno-ketones and cyclic silthianes
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 2642-2644
- https://doi.org/10.1039/j19680002642
Abstract
The perhalogeno-ketones (CF3)2CO, (CF3)(CF2Cl)CO, and (CF2Cl)2CO cause fission of the silicon–sulphur bonds in cyclic silthianes to produce polyhalogenosiloxanes, some of which are telomers. Thus, [–Me2SiOC(CF3)2S(CH2)2SC(CF3)2O–] has a degree of polymerization of about 9, though this decreases in the compounds of lower fluorine and higher chlorine content, and [–Me2SiOC(CF3)2SCH2CH2CH2SC(CF3)2O–] is monomeric. [–Me2SiOC(CF3)2SC(CF3)2O–] appears to have very labile Si–O bonds, distilling as a monomer, but appearing to undergo immediate ring-expansion in the liquid. Me2Si[OC(CF2Cl)2]2S remains monomeric.Keywords
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