Synthesis of unsymmetrical N-carboranyl NHCs: directing effect of the carborane anion
Synthesis of unsymmetrical N-carboranyl NHCs: directing effect of the carborane anion
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DOI：
10.1039/c4cc08267b
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发表时间：
2015-01-01
影响因子：
4.9
通讯作者：
Lavallo, Vincent
中科院分区：
文献类型：
--
作者：
Asay, Matthew J.;Fisher, Steven P.;Lavallo, Vincent
报道了含有单个 N-结合二十面体碳硼烷阴离子取代基的不对称 N-杂环卡宾 (NHC) 的合成。阴离子 C-2 和双去质子化双阴离子 C-2/C-5 NHC 锂配合物均被分离出来。后一种物质是选择性形成的，这揭示了二十面体碳硼烷阴离子取代基所传达的令人惊讶的定向效应。
The syntheses of unsymmetrical N-heterocyclic carbenes (NHCs) that contain a single N-bound icosahedral carborane anion substituent are reported. Both anionic C-2 and doubly deprotonated dianionic C-2/C-5 NHC lithium complexes are isolated. The latter species is formed selectively, which reveals a surprising directing effect conveyed by icosahedral carborane anion substituents.