Abstract
Disiloxane does not form stable adducts with boron trifluoride and trichloride, but cleavage of an Si—O bond occurs with formation of the corresponding monohalogenosilane and siloxyboron dihalide. Although siloxyboron dichloride is stable at room temperature, siloxyboron difluoride disproportionates into silyl fluoride, boron trifluoride, and boron trioxide. A stepwise mechanism involving four-center cyclic transition states is postulated for the over-all reaction.Disilthian does not react with boron trifluoride. This indicates that the sulphur atom in the Si—S—Si linkage system has little, if any, electron-donor activity. The absence of electron-donor activity for oxygen and sulphur in Si—O—Si and Si—S—Si linkages is discussed.
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