Co‐Condensation Reactions of Substituted Aromatic Compounds with Lithium Atoms at 77 K
作者:John P. Dunne、Matthias Bockmeyer、Matthias Tacke
DOI:10.1002/ejic.200390065
日期:2003.2
Lithium atoms were co-condensed with +I-substituted benzene derivatives like trimethyl(phenyl)silane and tert-butylbenzene in the presence of THF at 77 K, which resulted in C−H bond activation, to produce the aryllithium compound as well as the coupling of the substituted phenyl radicals. Other +I-substituted benzene derivatives like xylene and mesitylene failed to react with lithium atoms in the presence
在 77 K 的 THF 存在下,锂原子与 +I 取代的苯衍生物如三甲基(苯基)硅烷和叔丁基苯共缩合,导致 C-H 键活化,产生芳基锂化合物以及取代苯基的偶联。其他+I-取代的苯衍生物如二甲苯和均三甲苯在THF存在下不能与锂原子反应。氧和氮供体取代的苯衍生物(苯甲醚、N,N-二甲基苯胺和 N,N-二甲基苄胺)在 THF 存在下与锂原子共缩合时显示出邻位 CH 键的活化。然而,当苯硫醚与锂原子和 THF 共缩合时,反而发生了 CS 键断裂。这些结果是在 DFT 计算的帮助下解释的,其中显示了作为反应中间体的锂簇和苯衍生物之间的 π- 和 σ-复合物。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)