Hückel (4n+2) rule: planar conjugated monocycle aromatic iff π-count mod 4 = 2

Layer 2 — Chemistryin the heterocyclic-chemistry subtree

Hückel's 4n+2 rule (Hückel 1931, degenerate-perturbation theory on the cyclic MO ladder): a planar, fully-conjugated, monocyclic system with (4n+2) π-electrons is aromatic; with 4n π-electrons it is anti-aromatic (destabilised, will…

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