In CF3CO2H solution, ethylferrocenes bearing a 2-t-butyl substituent undergo protonation to give the corresponding vinyl cations which, though short-lived, can be observed by 1H n.m.r. spectroscopy.
T. S. Abram and W. E. Watts, J. Chem. Soc., Chem. Commun., 1974, 857 DOI: 10.1039/C39740000857
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