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Updated: Apr 28, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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固体状態の巨大なトリプチーセンの回転: ナノスケールの人工分子機械を設計する方向へ

Xing Jiang1, Braulio Rodríguez-Molina, Narega Nazarian

  • 1Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095-1569, United States.

Journal of the American Chemical Society
|June 10, 2014
PubMed
まとめ

この研究は,大きなトリプチセンの回転器を備えた新しい固体分子回転器を提示しています. ステリック障害が増加したにもかかわらず,ローターは固体状態で急速な動きを達成し,効率的な分子動態を示しています.

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Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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