The π ring current in an even-electron monocycle is dominated by the HOMO–LUMO transition, and hence corresponds to circulation of four electrons in a diatropic (4n + 2)-electron, but two in a paratropic (4n)-electron cycle.
Four- and two-electron rules for diatropic and paratropic ring currents in monocyclic π systems
E. Steiner and P. W. Fowler, Chem. Commun., 2001, 2220 DOI: 10.1039/B104847N
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