Sterically driven synthesis of ruthenium and ruthenium–silver N-heterocyclic carbene complexes
作者:C. Cesari、S. Conti、S. Zacchini、V. Zanotti、M. C. Cassani、R. Mazzoni
DOI:10.1039/c4dt02747g
日期:——
A sterically driven synthetic route from non-bulky silver NHC to novel Ru(NHC) complexes and from bulky Ag(NHC) to unprecedented heterobimetallic Ru–Ag(NHC) complexes is presented.
N‐heterocyclic carbene–palladium complexes for Suzuki–Miyaura coupling reaction with benzyl chloride and aromatic boronic acid leading to diarylmethanes
作者:Ming‐Tsz Chen、Wan‐Rong Wang、Yi‐Jun Li
DOI:10.1002/aoc.4912
日期:2019.6
A family of N‐heterocyclic carbene–palladium(II)–N,N‐dimethylbenzylamine complexes ((NHC)LPdCl2; L = N,N‐dimethylbenzylamine) were synthesized as well as characterized using single‐crystal X‐ray diffraction and spectroscopic data. These complexes exhibited higher catalytic activities for the Suzuki reaction of benzyl chlorides to afford diarylmethanes under milder conditions than other efficient (NHC)LPdCl2
合成了N-杂环卡宾-钯(II)-N,N-二甲基苄胺络合物((NHC)LPdCl 2 ; L = N,N-二甲基苄胺)并使用单晶X射线衍射和光谱进行了表征数据。与其他有效的(NHC)LPdCl 2络合物相比,这些络合物在温和的条件下对苄基氯的Suzuki反应表现出更高的催化活性,从而生成二芳基甲烷。使用最佳条件,可以以中等至高收率获得预期的偶联产物。所有反应均在空气中进行,所有起始原料均不经纯化直接使用。
Studies of Ligand Exchange in N-Heterocyclic Carbene Silver(I) Complexes
作者:Haw-Lih Su、Lisa M. Pérez、Sheng-Jui Lee、Joseph H. Reibenspies、Hassan S. Bazzi、David E. Bergbreiter
DOI:10.1021/om300340w
日期:2012.5.28
of N-heterocyclic carbene (NHC) Ag(I) complexes have been prepared and used to study the dynamics of NHC ligand exchange in these Ag(I) complexes. These studies used solution-state variable-temperature (VT) 13C NMR spectroscopy and the temperature-dependent changes in 13C–107/109Ag coupling to determine activation energies for the ligand exchange process. The effects of concentration, bridging anions
已经制备了一系列N-杂环卡宾(NHC)Ag(I)配合物,并用于研究这些Ag(I)配合物中NHC配体交换的动力学。这些研究中使用溶液状态的变温(VT)13 C NMR光谱和在依赖于温度的变化13 C- 107/109的Ag耦合,以确定配体交换过程的活化能。研究了浓度,桥联阴离子和添加剂对交换过程的影响。这些银配合物的NHC配体交换过程的实验活化能也与DFT计算进行了比较。结果与Ag(I)-NHC交换过程的关联机制一致。
Non-classical NHC transfers from the reaction of (IMes)AgCl with osmium carbonyl clusters
作者:Craig E. Cooke、Taramatee Ramnial、Michael C. Jennings、Roland K. Pomeroy、Jason A. C. Clyburne
DOI:10.1039/b703071c
日期:——
N-Heterocyclic carbene transfer reactions were attempted using IMesAgCl and two osmium clusters. The products isolated from these reactions suggest that NHC transfers can be unpredictable.
Lewisacidcatalysis and nucleophilic carbene catalysis are complementary fundamental concepts to accelerate and control chemical reactions of aldehyde substrates. Their efficient merger has recently been achieved using two separate catalyst species. The present report describes our efforts to develop a cooperative catalyst system which incorporates both features –Lewisacid and nucleophilic NHC –