Huckel rule


Hüc·kel rule

(hēck'el), the number of depolarized electrons in an aromatic ring is equal to 4n + 2 where n is 0 or any positive integer; l-tyrosine, l-phenylalanine, l-tryptophan, and l-histidine (when the imidazole ring is deprotonated) obey this rule. [Erich Hückel]

Hüc·kel rule

(hē'kĕl rūl) The number of depolarized electrons in an aromatic ring is equal to 4n + 2 where n is 0 or any positive integer; l-tyrosine, l-phenylalanine, l-tryptophan, and l-histidine (when the imidazole ring is deprotonated) obey this rule. [Erich Hückel]