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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Eclipsed conformation ： ウィキペディア英語版 Eclipsed conformation (詳細はchemistry an eclipsed conformation is a conformation in which two substituents X and Y on adjacent atoms A, B are in closest proximity, implying that the torsion angle X-A-B-Y is 0°.〔Ernest L. Eliel and Samuel H. Wilen, "Stereochemistry of Organic Compounds", Wiley (1994), p.1197〕 Such a conformation exists in any open chain, single chemical bond connecting two sp3 hybridised atoms, and it is normally a conformational energy maximum. This maximum is often explained by steric hindrance, but its origins sometimes actually lie in hyperconjugation (as when the eclipsing interaction is of two hydrogen atoms). In the example of ethane in Newman projection it shows that rotation around the carbon-carbon bond is not entirely free but that an energy barrier exists. The ethane molecule in the eclipsed conformation is said to suffer from torsional strain and by a rotation around the carbon carbon bond to the staggered conformation around 12.5 kJ/mol of torsional energy is released. ==See also== *Gauche effect 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Eclipsed conformation」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.