Reactivity Consequences of Substituent-Dependent Preaggregation Motifs of n- and tert-Butyllithium towards 1,3,5-Triazacyclohexanes†

Reactivity Consequences of Substituent-Dependent Preaggregation Motifs of n- and tert-Butyllithium towards 1,3,5-Triazacyclohexanes†
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正丁基锂和叔丁基锂对 1,3,5-三氮杂环己烷的取代基依赖性预聚集基序的反应性后果â 

DOI:
10.1002/ejic.201301267
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发表时间:
2014
影响因子:
2.3
通讯作者:
N. W. Mitzel
N. W. Mitzel
中科院分区:
化学3区
文献类型:
--
作者:
M. Hülsmann;A. Mix;B. Neumann;H.-G. Stammler;N. W. Mitzel

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用tBuLi处理环状三缩醛胺1,3,5-三叔丁基-1,3,5-三氮杂环己烷(TtBuTAC),但在CH 2单元上没有发生预期的去质子化,而是形成了[(TtBuTAC)(tBuLi)](2)加合物。这是tBuLi的单体四配位形式;其分子结构通过单晶X射线衍射(XRD)测定,根据1H NMR、13 C NMR和7 Li NMR光谱,它在C6 D 6溶液中可能是单体。TtBuTAC与nBuLi反应,得到四个nBuLi单元以两个TtBuTAC配体封端的梯形聚集体[(TtBuTAC)(nBuLi)2] 2。通过NMR和XRD对该加合物进行了表征。它在溶液中缓慢衰减,并且获得少量的[TtBuTAC-Li(μ-nBu)]2[Li 3(nBu)2N(tBu)(n-Li)]产物,并通过XRD表征。该化合物含有来自TtBuTAC的形式单体Me 3C-N = CH 2与nBuLi反应的酰胺单元,这证明了三胺醛如TtBuTAC的不同类型的反应性。
The cyclic triaminal 1,3,5‐tri‐tert‐butyl‐1,3,5‐triazacyclohexane (TtBuTAC) was treated withtBuLi, but instead of the expected deprotonation at a CH2unit, the [(TtBuTAC)(tBuLi)] (2) adduct was formed. This is a monomeric tetracoordinate form oftBuLi; its molecular structure was determined by single‐crystal X‐ray diffraction (XRD) and it is likely to be monomeric in C6D6solution according to1H NMR,13C NMR, and7Li NMR spectroscopy. TtBuTAC reacts withnBuLi to give a laddertype [(TtBuTAC)(nBuLi)2]2aggregate of fournBuLi units terminated by two TtBuTAC ligands. This adduct was characterized by NMR spectroscopy and XRD. It slowly decays in solution, and minor quantities of a [TtBuTAC‐Li(μ‐nBu)]2[Li3(nBu)2N(tBu)(n‐pent)] product were obtained and characterized by XRD. This compound contains amide units from the reaction of the formal monomer of TtBuTAC, Me3C‐N=CH2, withnBuLi, which demonstrates the different types of reactivity of trisaminals such as TtBuTAC.
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