Crystal Structures of the Chiral Diamine (<i>R,R</i>)-TMCDA with the Commonly Used Alkyllithium Bases Methyllithium, <i>iso</i>-Propyllithium, and <i>sec-</i>Butyllithium
作者:Carsten Strohmann、Viktoria H. Gessner
DOI:10.1021/ja072970t
日期:2007.7.1
(R,R)-N,N,N‘,N‘-Tetramethyl-1,2-diaminocyclohexane [(R,R)-TMCDA] coordinated alkyllithiums crystallize as dimeric [MeLi·(R,R)-TMCDA]2 and [i-PrLi·(R,R)-TMCDA]2 and monomeric s-BuLi·(R,R)-TMCDA. s-BuLi·(R,R)-TMCDA is the first structurally characterized Lewis base coordinated adduct of s-BuLi. The high reactivity of s-BuLi·(R,R)-TMCDA in deprotonation reactions results from the monomeric structure.
(R,R)-N,N,N',N'-四甲基-1,2-二氨基环己烷 [(R,R)-TMCDA] 配位的烷基锂结晶为二聚体 [MeLi·(R,R)-TMCDA]2 和[i-PrLi·(R,R)-TMCDA]2 和单体 s-BuLi·(R,R)-TMCDA。s-BuLi·(R,R)-TMCDA 是第一个具有结构特征的 s-BuLi 路易斯碱配位加合物。s-BuLi·(R,R)-TMCDA 在去质子化反应中的高反应性源于单体结构。