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.

中文翻译：

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芳香度规则

1931 年，Erich Hückel 发表了一篇具有里程碑意义的论文——以他的名字命名的现在著名的 4n + 2 环烯芳香性规则的种子。此后，电子计数已扩展到其他类别的化合物，产生了许多旨在捕捉芳香性概念及其对化学影响的规则。