Cyclo-octa-1,5-diene(duroquinone)nickel(O) has been shown to protonate at the duroquinone carbonyls in HSO3F to yield a stable dication. The chemical shift of the OH protons indicates very extensive positive charge delocalization through backbonding.
M. Brookhart and G. J. Young, J. Chem. Soc., Chem. Commun., 1974, 205 DOI: 10.1039/C39740000205
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