Anellated N-Heterocyclic Carbenes: 1,3-Dineopentylnaphtho[2,3-d]imidazol-2-ylidene: Synthesis, KOH Addition Product, Transition-Metal Complexes, and Anellation Effects
作者:Shanmuganathan Saravanakumar、Anca I. Oprea、Markus K. Kindermann、Peter G. Jones、Joachim Heinicke
DOI:10.1002/chem.200501183
日期:2006.4.3
Two novel anellated N-heterocyclic carbenes (NHC), 1,3-dineopentylnaphtho[2,3-d]imidazol-2-ylidene, and 1,3-dineopentyl-2-ylido-imidazolo[4,5-b]pyridine were obtained by reduction of the respective thiones with potassium, the former also by deprotonation of the corresponding naphthimidazolium hexafluorophosphate by using excess KH in THF. The use of equimolar amounts of KH provided an unexpected formal
两个新颖的带电荷的N-杂环卡宾(NHC)分别是1,3-二烯戊基萘[2,3-d]咪唑-2-亚基和1,3-二烯戊基-2-ylido-咪唑并[4,5-b]吡啶通过用钾还原相应的硫酮获得前者,前者还通过在THF中使用过量的KH使相应的萘并咪唑六氟磷酸盐去质子化。等摩尔量的KH的使用提供了这种NHC与KOH的出乎意料的形式加成产物。加合物的X射线晶体结构分析提供了被两个THF分子稳定的扭曲的四聚N-杂环醇盐的证据。在C(6)D(6)中,化合物发生歧化。合成了新型萘并咪唑-2-亚烷基的过渡金属配合物[(NHC)AgCl],[(NHC)Rh(cod)Cl]和(E)-[(NHC)(2)PdCl(2)]。X射线晶体结构以及(1)H和(13)C NMR光谱数据提供了详细的结构信息。将特征数据与无代数和不同代数的NHC或其复合物的特征数据进行比较,可提供有关扩展代数的影响的信息。