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- Hückel's_rule abstract "In organic chemistry, Hückel's rule estimates whether a planar ring molecule will have aromatic properties. The quantum mechanical basis for its formulation was first worked out by physical chemist Erich Hückel in 1931. The succinct expression as the 4n+2 rule has been attributed to von Doering (1951), although several authors were using this form at around the same time.A cyclic ring molecule follows Hückel's rule when the number of its π-electrons equals 4n+2 where n is zero or any positive integer, although clearcut examples are really only established for values of n = 0 up to about n = 6. Hückel's rule was originally based on calculations using the Hückel method, although it can also be justified by considering a particle in a ring system, by the LCAO method and by the Pariser–Parr–Pople method.Aromatic compounds are more stable than theoretically predicted by alkene hydrogenation data; the "extra" stability is due to the delocalized cloud of electrons, called resonance energy. Criteria for simple aromatics are: the molecule must follow Huckel's rule, having 4n+2 electrons in the delocalized, conjugated p-orbital cloud; the molecule must be able to be planar; the molecule must be cyclic; and, every atom in the ring must be able to participate in delocalizing the electrons by having a p-orbital or an unshared pair of electrons.↑ ↑ ↑ ↑ ↑ ↑".
- Hückel's_rule thumbnail Benzol.svg?width=300.
- Hückel's_rule wikiPageID "862361".
- Hückel's_rule wikiPageRevisionID "600554459".
- Hückel's_rule subject Category:Physical_organic_chemistry.
- Hückel's_rule subject Category:Rules_of_thumb.
- Hückel's_rule comment "In organic chemistry, Hückel's rule estimates whether a planar ring molecule will have aromatic properties. The quantum mechanical basis for its formulation was first worked out by physical chemist Erich Hückel in 1931.".
- Hückel's_rule label "Hückel's rule".
- Hückel's_rule label "Hückel-Regel".
- Hückel's_rule label "Regla de Hückel".
- Hückel's_rule label "Regola di Hückel".
- Hückel's_rule label "Regra de Hückel".
- Hückel's_rule label "Reguła Hückla".
- Hückel's_rule label "Règle de Hückel".
- Hückel's_rule label "قاعدة هوكل".
- Hückel's_rule label "ヒュッケル則".
- Hückel's_rule label "休克尔规则".
- Hückel's_rule sameAs H%C3%BCckel's_rule.
- Hückel's_rule sameAs Hückel-Regel.
- Hückel's_rule sameAs Regla_de_Hückel.
- Hückel's_rule sameAs Règle_de_Hückel.
- Hückel's_rule sameAs Aturan_Hückel.
- Hückel's_rule sameAs Regola_di_Hückel.
- Hückel's_rule sameAs ヒュッケル則.
- Hückel's_rule sameAs 휘켈_규칙.
- Hückel's_rule sameAs Reguła_Hückla.
- Hückel's_rule sameAs Regra_de_Hückel.
- Hückel's_rule sameAs Q534307.
- Hückel's_rule sameAs Q534307.
- Hückel's_rule wasDerivedFrom Hückel's_rule?oldid=600554459.
- Hückel's_rule depiction Benzol.svg.