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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 Silylium ion ： ウィキペディア英語版 Silylium ion A silylium ion is a reactive silyl-containing cation with the formula SiR3+. With three, rather than the usual four bonds to Si, silylium ions are the silicon analogues of carbenium ions. They can be viewed as protonated silylenes. A well characterized example is the trimesitylsilylium, Si(C6H2Me3)3+. This salt has been crystallized with an anionic carborane, a weakly coordinating anion. This cation is related to trityl (C(C6H5)3+), with the extra methyl groups providing steric protection, compensating for the greater size of Si vs C. Its 29Si NMR chemical shift is 225.5 ppm, downfield of TMS, which indicates that the cation is quite "naked". In contrast, Me3SiOTf, normally considered a source of electrophilic silicon, has a 29Si NMR shift of 43 ppm.〔Hendrik F. T. Klare and Martin Oestreich "Perspective: Silylium Ions in Catalysis" Dalton Trans., 2010, pp. 9176-9184. 〕 ==References== 〔 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「Silylium ion」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.