A series of racemic N-aryl-substituted trans-1,2-diaminocyclohexyl (t-1,2-DACH)-linked bis(amidines) were synthesised and their solution behaviour, and solid-state structures were investigated. The amidine functionalities within these compounds were extremely sterically hindered, with ortho-aryl substitution found to hinder N–Ar bond rotation. The results of these studies were used to rationalise the lack of reactivity of these compounds with [YN(SiMe3)2}3]. Dilithiation of the t-1,2-DACH linked bis(amidines) did, however, proceed easily and the solution behaviour and solid-state structures of the resulting THF-solvated lithium amidinates were investigated. All the compounds showed similar structures in the solid-state, while NMR experiments indicated that the solid-state structures were likely to be maintained in solution. Attempted metathesis reactions with YCl3 did not, however, yield the desired yttrium chloride complexes.
合成了一系列外消旋N-芳基取代的反式-1,2-二
氨基环己基(t-1,2-
DACH)-连接的双(脒),并研究了它们的溶液行为和固态结构。这些化合物中的脒官能团受到极大的空间位阻,发现邻位芳基取代会阻碍 N-Ar 键旋转。这些研究的结果用于合理解释这些化合物与 [YN(SiMe3)2}3] 缺乏反应性。然而,t-1,2-
DACH 连接的双(脒)的二
锂化确实很容易进行,并且研究了所得 THF 溶剂化
锂脒盐的溶液行为和固态结构。所有化合物在固态下都显示出相似的结构,而核磁共振实验表明固态结构很可能在溶液中保持不变。然而,尝试与 YCl3 进行复分解反应并没有产生所需的
氯化钇络合物。