Calculations by the CNDO/2 method on the σ-complex energy in the protonation of azulene and benzofuran show that, when the molecule has rings with different numbers of atoms, the use of all-valence-electron methods results in substantial modifications in the order of reactivity compared with that obtained by considering only π-electrons.
E. Silla, J. Bertrán and J. I. Fernández-Alonso, J. Chem. Soc., Perkin Trans. 2, 1975, 366 DOI: 10.1039/P29750000366
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