Quantitative Assessment of the Lewis Acidity of Silylium Ions
Quantitative Assessment of the Lewis Acidity of Silylium Ions
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DOI：
10.1021/acs.organomet.5b00556
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发表时间：
2015-10-26
期刊：
影响因子：
2.8
通讯作者：
Mueller, Thomas
中科院分区：
文献类型：
--
作者：
Grossekappenberg, Henning;Reissmann, Matti;Mueller, Thomas
应用Gutmann-Beckett方法对几种芳基取代的四锂离子的刘易斯酸性进行了实验分类，并通过计算氟离子亲和力（FIA）（四锂元素= Si、Ge）进行了计算。根据这些测量，四氢正离子比硼烷明显更具有刘易斯酸性，并且芳基取代的甲硅烷基硼酸盐是最强的可分离的刘易斯酸之一。通过利用电子和/或空间取代基效应，可以微调甲硅烷基离子的刘易斯酸性。
The Lewis acidity of several aryl-substituted tetrylium ions was classified experimentally by applying the Gutmann-Beckett method and computationally by calculation Of fluoride ion affinities (FIA) (tetrel elements = Si, Ge). According to these measures, tetrylium ions are significantly more Lewis acidic than boranes, and aryl-substituted silylium borates are among the strongest isolable Lewis acids. A fine-tuning of the Lewis acidity of silylium ions is possible by taking advantage of electronic and/or steric substituent effects.