Hückel's Rule

Hückel's Rule is a guideline in organic chemistry used to identify aromatic compounds, which are cyclic molecules that are unusually stable. According to this rule, a planar ring structure is considered aromatic if it contains a specific number of pi electrons, specifically 4n + 2 (where n is a non-negative integer: 0, 1, 2, etc.). This means compounds with 2, 6, 10, etc., pi electrons in their cyclic, conjugated system will exhibit aromatic stability. Aromatic compounds often have unique properties, including pleasant odors and distinct chemical reactivity.