title: Four- and two-electron rules for diatropic and paratropic ring currents in monocyclic pi systems.
abstract: The pi ring current in an even-eletron 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.
authors.affiliation: School of Chemistry, University of Exeter, Stocker Road, Exeter, UK EX4 4QD. E.Steiner@exeter.ac.uk
authors.forename: E
authors.initials: E
authors.lastname: Seiner
authors.forename: P W
authors.initials: PW
authors.lastname: Fowler