In 1931, Erich Hückel published a landmark paper — the seed of the now famous 4n + 2 rule for aromaticity in annulenes that bears his name. Electron counting has since been extended to other classes of compounds, resulting in a multitude of rules aiming to capture the concept of aromaticity and its impact in chemistry.
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Acknowledgements
The following organizations are thanked for financial support: the Ministerio de Ciencia e Innovación (MICINN, project number PID2020-113711GB-I00) and the Generalitat de Catalunya (project number 2017SGR0039). I am grateful to A. Artigas and K. Jorner for their careful reading and suggestions of improvement.
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Solà, M. Aromaticity rules. Nat. Chem. 14, 585–590 (2022). https://doi.org/10.1038/s41557-022-00961-w
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DOI: https://doi.org/10.1038/s41557-022-00961-w
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