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Haiges, Ralf; Baxter, Amanda F.; Goetz, Nadine R.; Axhausen, Joachim A.; Soltner, Theresa; Kornath, Andreas; Christe, Karl O. (2016): Protonation of nitriles: isolation and characterization of alkyl- and arylnitrilium ions. In: Dalton Transactions, Vol. 45, No. 20: pp. 8494-8499
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The reactions of acetonitrile, propionitrile, butyronitrile, N,N-dimethylaminoacetonitrile, benzonitrile, o-tolunitrile and 1,4-dicyanobenzene with HF/AsF5 or HF/SbF5 in anhydrous HF result in protonation of the nitrile. The obtained nitrilium ions were isolated as [AsF6](-), [SbF6](-) and [Sb2F11](-) salts and characterized by multinuclear NMR and vibrational spectroscopy, and their X-ray crystal structures.