The 13C n.m.r. spectra of semibullvalene and a number of its annulated derivatives provide valuable information on the direction of the valence tautomeric equilibria in nondegenerate examples.
E. Wenkert, E. W. Hagaman, L. A. Paquette, R. E. Wingard and R. K. Russell, J. Chem. Soc., Chem. Commun., 1973, 135 DOI: 10.1039/C39730000135
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