翻訳と辞書 Words near each other ・ Hypercompe tenebra ・ Hypercompe tessellata ・ Hypercompe testacea ・ Hypercompe theophila ・ Hypercompe trinitatis ・ Hypercompe turruptianoides ・ Hypercompetition ・ Hypercomplex analysis ・ Hypercomplex cell ・ Hypercomplex manifold ・ Hypercomplex number ・ Hypercomputation ・ Hyperconcentrated flow ・ Hypercone ・ Hypercone (spacecraft) ・ Hyperconjugation ・ Hyperconnected space ・ Hyperconnectivity ・ Hyperconsumerism ・ Hypercorrection ・ Hypercoryphodon ・ HyperCourseware ・ Hypercube ・ Hypercube graph ・ Hypercubic honeycomb ・ Hypercycle ・ Hypercycle (chemistry) ・ Hypercycle (hyperbolic geometry) ・ Hypercyclic morphogenesis ・ Hypercyclic operator Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Hyperconjugation ： ウィキペディア英語版 Hyperconjugation In organic chemistry, hyperconjugation is the interaction of the electrons in a sigma bond (usually C–H or C–C) with an adjacent empty (or partially filled) non-bonding p-orbital, antibonding σ or π orbital, or filled π orbital, to give an extended molecular orbital that increases the stability of the system.〔John McMurry. ''Organic chemistry'', 2nd edition. ISBN 0-534-07968-7〕 Only electrons in bonds that are β to the positively charged carbon can stabilize a carbocation by hyperconjugation. == History == The term was introduced in 1939 by Robert S. Mulliken〔 〕 in the course of his work on UV spectroscopy of conjugated molecules. Mulliken observed that on adding alkyl groups to alkenes the spectra shifted to longer wavelengths. This bathochromic shift is well known in regular conjugated compounds such as butadiene. He was also the first to attribute the lower heat of hydrogenation for these substituted compounds (compared to those without substitution) to hyperconjugation. An effect predating the 1939 hyperconjugation concept is the Baker–Nathan effect reported in 1935. 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「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.