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Aromaticity rules for cycles with arbitrary numbers of half-twists.

Authors
Type
Published Article
Journal
Physical chemistry chemical physics : PCCP
Publication Date
Volume
8
Issue
15
Pages
1775–1777
Identifiers
PMID: 16633661
Source
Medline
License
Unknown

Abstract

A simple proof is given that the Hückel aromaticity rules generalise to cycles with an arbitrary number of half-twists, T; addition/removal of half-twists two at a time preserves all eigenvalues and degeneracies, so that closed-shell aromatic systems occur at pi-electron counts 4N+ 2, and antiaromatic at 4N for even T, and vice versa for odd T.

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