Benzonitrile Insertion into Silylarylamides –
<i>ansa</i>
‐Bis(benzamidinate) Ligand Systems with Rigid
<i>o</i>
‐ and
<i>m</i>
‐Phenylene Linkers in the Synthesis of Lithium and Rare Earth Complexes
作者:Grigorii G. Skvortsov、Georgy K. Fukin、Sergey Yu. Ketkov、Anton V. Cherkasov、Konstantin A. Lyssenko、Alexander A. Trifonov
DOI:10.1002/ejic.201300351
日期:2013.8.12
reactions of the lithium silylarylamides [1,2-C6H4(NSiMe3)2Li2]2 and [1,3-C6H4(NSiMe3)2Li2] with two equivalents of PhCN [tetrahydrofuran (thf), room temp.] is an efficient synthetic approach to the ansa-bis(amidinate) ligand systems [1,2-C6H4NC(Ph)NSiMe3}2Li2(thf)]2 and [1,3-C6H4NC(Ph)NSiMe3}2Li2(thf)2]2, which were isolated in 54 and 60 % yields, respectively. However, lithium silylarylamide [2,6-C5H3N(NSiMe3)2Li2]
甲硅烷基芳基酰胺锂 [1,2-C6H4(NSiMe3)2Li2]2 和 [1,3-C6H4(NSiMe3)2Li2] 与两当量 PhCN [四氢呋喃 (thf),室温] 的反应是一种有效的合成方法ansa-双(脒)配体系统 [1,2-C6H4NC(Ph)NSiMe3}2Li2(thf)]2 和 [1,3-C6H4NC(Ph)NSiMe3}2Li2(thf)2]2 ,分别以 54% 和 60% 的产率分离出来。然而,即使在高温(thf,甲苯)下,含有吡啶片段的甲硅烷基芳基酰胺锂 [2,6-C5H3N(NSiMe3)2Li2] 也不会进行 PhCN 插入,并且该反应提供了甲硅烷基酰胺基复合物 [2,6-C5H3NNSiMe3} 2Li2]3·(C6H5CN)4,含有配位的苄腈分子。化合物的不同反应性与通过 DFT 计算估计的分子轨道能量的变化相关。无水 YCl3 与脒酸锂 [1,2-C6