Low-Temperature X-ray Crystal-Structure Analysis of the Thermally Unstable Lithiated 2-Butenyltert-Butyl Sulfide: A comparison with modelab initio MO calculations
作者:Dieter Seebach、Thomas Maetzke、Richard K. Haynes、Michael N. Paddon-Row、Stephen S. Wong
DOI:10.1002/hlca.19880710202
日期:1988.3.16
N′-tetramethylethylenediamine (TMEDA) complex 6 of the title compound have been isolated. Compound 6 decomposes in the crystalline state above −20°. From the bond lengths and angles obtained by X-ray crystal-structure analysis (data collected at −70°), compound 6 is best described as a (E)-1-(tert-butylthio)-1-lithio-2-butene with the double bond acting as an additional ligand on lithium (unsymmetrical allylic
分离出标题化合物的N,N,N ′,N′-四甲基乙二胺(TMEDA)配合物6的单晶。化合物6在-20°以上以结晶状态分解。从通过X射线晶体结构分析(在-70°处收集的数据)获得的键长和角度,化合物6可以最好地描述为(E)-1-(叔丁基硫基)-1-硫基-2-丁烯双键作为锂(不对称烯丙基)上的额外配体。S-原子与丁烯基系统的四个C-原子在一个共同的平面中呈环状排列。该Ť-Bu基团和锂原子位于该平面的上方和下方。关于6的反应性(α/γ反应性)讨论了该结构。通过从头开始对模型硫代硫基-1-硫醇7(SHS代替t- BuS,CH 2代替CHCH 3,没有Li的溶剂化)的SCF MO计算,总结构出人意料地好。显着的差异是计算结构中烯丙基部分的对称性。