Medical Definition of Huckel's rule
1.
The number of depolarised electrons in an aromatic ring is equal to 4n + 2 where n is zero or any positive integer; l-tyrosine, l-phenylalanine, l-tryptophan, and l-histidine (when the imidazole ring is deprotonated) obey this rule.
(05 Mar 2000)
Lexicographical Neighbors of Huckel's Rule
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