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The Hückel–London–Pople–McWeeny approach to calculating ring currents in conjugatedsystems is considered in detail, especially the ‘topological’ variant of this formalism, particularly emphasisedduring the last five years. A step-by-step account is given of how these calculations are effected inpractice, in such a way as to enable any interested reader to carry out these computations himself. Themethod is illustrated by using it to assess the applicability of the so-called ‘Annulene-Within-an-Annulene(AWA) Rule’ to ‘super-ring’ conjugated hydrocarbons — some in which the inner ring and outer perimeterare ‘coupled’, and others in which they are ‘decoupled’. Compliance with the AWA model appearsmore probable in decoupled super-ring structures than in coupled ones. The Appendix touches on previouswork involving Professor D. J. Klein, the honorand of this issue. (doi: 10.5562/cca2291

An Analysis of Topological Ring-Currents and their Use in Assessing the Annulene-Within-an-Annulene Model for Super-Ring Conjugated Systems