Protonation of stereoisomeric spirocyclopropane-anthrones in 96% D2SO4 led to stable hydroxy-carbonium ions whose n.m.r. spectra and retention of stereochemistry upon deprotonation were consistent with static bridged ions rather than equilibrating open-ring mixtures.
J. W. Pavlik and N. Filipescu, J. Chem. Soc. D, 1970, 765 DOI: 10.1039/C29700000765
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