Purple solutions containing N-trifluoromethylsulphamate N-oxyl can be prepared by treatment of trifluoronitrosomethane with aqueous alkali-metal hydrogen sulphite in the presence of lead dioxide; addition of tetraphenylarsonium chloride to such a solution results in precipitation of the pale purple tetraphenylarsonium salt [CF3·N(O)·SO3–Ph4As+].
R. E. Banks, D. J. Edge, J. Freear and R. N. Haszeldine, J. Chem. Soc., Perkin Trans. 1, 1974, 721 DOI: 10.1039/P19740000721
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