Abstract
Methods for the synthesis and structures of metallocenylmethyl cations are considered using stable permethyl derivatives as examples. The simplest and most convenient procedure for the preparation of mono-, di-, and trications involves oxidation of permethylmetallocenes (M = Ru or Os) with oxygen in the presence of strong protic acids. Based on the results of physicochemical studies (X-ray diffraction analysis, 1H and 13C NMR spectroscopy) and quantum-chemical calculations (density functional theory), a resonance hybrid with contributions of the metallonium (onium), carbocationic, and fulvene structures was proposed for the description of the structures of these cations.
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