Many N-silylphosphinimines Me3SiN˭P(X) RR′ undergo facile thermal decomposition with elimination of substituted silanes Me3SiX and formation of cyclic or polymeric phosphazenes (RR′PN). The process which is a new, general synthesis of phosphazenes has been used to prepare poly(dimethylphosphazene), (Me2PN), in nearly quantitative yield from Me3SiN˭P(OCH2CF3)Me2. Convenient synthetic routes to the necessary silicon-nitrogen-phosphorus precursors are described and the results of their decomposition reactions are reported.
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Neilson et al. (1981) studied this question.
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