(RzSiO),. nBFs,(R&iFO) BF*,(RzSiFO) aB,(RzSiF) zO, R&iFz (R? Si0) 3, by a series of disproportionation reactions. the exception of the coordination complexes, the intermediate fluorine compounds disproportionate much more readily than the corresponding chlorine compounds. sym-Tetramethyldifluorodisiloxane disproportionates slowly but completely at room temperature with the evolution of gaseous dimethyldifluorosilane and the formation ...