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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 Negative hyperconjugation ： ウィキペディア英語版 Negative hyperconjugation In organic chemistry, negative hyperconjugation is the donation of electron density from a filled π- or p-orbital to a neighboring σ *-orbital.〔(【引用サイトリンク】title=Negative Hyper-Conjugation )〕 This phenomenon, a type of resonance, can stabilize the molecule or transition state. It also causes an elongation of the σ-bond by adding electron density to its antibonding orbital.〔 Negative hyperconjugation is most commonly observed when the σ *-orbital is located on certain C–F or C–O bonds, and does not occur to an appreciable extent with normal C–H bonds. In negative hyperconjugation, the electron density flows in the ''opposite'' direction (from π- or p-orbital to empty σ *-orbital) than it does in the more common hyperconjugation (from σ-orbital to empty p-orbital). ==See also== *Conjugated system 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「Negative hyperconjugation」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.