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The cations of NS2+·AsF6−, N(SCI)2+·AsF6− and NS+·AsF6− have been shown to be efficient initiators for the polymerization of tetrahydrofuran. The former two salts were found, by electron spin resonance spectroscopy, to produce remarkably high concentrations of persistent free radicals which have been identified as being entirely inorganic, namely N2S3+˙ and, more tentatively, N2S2+˙. A mechanism for generation of the radicals is proposed.
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Fairhurst et al. (1985) studied this question.
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