The occurrence of non-classic conjugation due to the overlapping of the non-parallel π-orbitals of the two aromatic systems in cis-1 phenyl-2-(4-pyridyl)cyclopropanes has been demonstrated by a study of charge-transfer (c.t.) complexes between iodine and a series of cis- and trans-1-(4-X-phenyl)-2-(4-pyridyl)cyclopropanes and from their acidity constants.
V. Mancini, P. Passini and S. Santini, J. Chem. Soc., Chem. Commun., 1978, 100 DOI: 10.1039/C39780000100
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