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The results of the solvolysis reported in Table I demonstrate that α-metallocenyl carbonium ions are remarkably stable. Indeed, the rates indicate that these α-metallocenyl carbonium cations are of the same order of stability as the triphenylmethyl cation. Qualitative observations such as the solubility of ferrocenecarboxyaldehyde in dilute hydrochloric acid and the facile conversion of phenylferrocenylcarbinol to the corresponding methyl ether by refluxing aqueous methanol previously have implied a high order of stability for such ions.
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Richards et al. (1959) studied this question.
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