To assess electronic effects on the very rapid semibullvalene valence isomerization process, a number of substituted derivatives of this hydrocarbon has been synthesized and the resulting perturbational effects on the individual equilibria evaluated by 1H n.m.r.
L. A. Paquette, D. R. James and G. H. Birnberg, J. Chem. Soc., Chem. Commun., 1974, 722 DOI: 10.1039/C39740000722
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