One Step Conversion of Heteroaromatic-N-Oxides to Imidazolo-Heteroarenes
摘要:
[GRAPHICS]Various pyridine-, quinoline-, isoquinoline-, and pyrimidine-N-oxides were converted to their corresponding alpha-imida-zoloheteroarenes in good yield by treatment with. sulfuryl diimidazole in nonpolar solvents at elevated temperatures.
Solid-state structure, solution-state behaviour and catalytic activity of electronically divergent C,N-chelating palladium–N-heterocyclic carbene complexes
作者:Michael R. Chapman、Benjamin R. M. Lake、Christopher M. Pask、Bao N. Nguyen、Charlotte E. Willans
DOI:10.1039/c5dt02194d
日期:——
picolyl-substituted imidazoliumsalts have been prepared and coordinated to palladium in a single step, to deliver a variety of palladium(II)–N-heterocyclic carbene (NHC) complexes. Neutral Pd(NHC)X2, cationic [Pd(NHC)2X]X and dicationic [Pd(NHC)2]X2-type complexes have been isolated and fully characterised, with single-crystal X-ray analysis revealing a variety of coordination environments around the palladium centres
已经制备了一系列电子多样的吡啶基和吡啶基取代的咪唑鎓盐,并可以在单个步骤中与钯配位,以提供各种钯(II)–N-杂环卡宾(NHC)配合物。分离并充分表征了中性Pd(NHC)X 2,阳离子性[Pd(NHC)2 X] X和阳离子性[Pd(NHC)2 ] X 2型配合物,单晶X射线分析揭示了多种钯中心周围的协调环境。预先形成的络合物已用于Suzuki-Miyaura模型的交叉偶联反应中,从而产生空间拥挤的四邻位取代的联芳基产品,其营业额数字可与Pd-PEPPSI-IPr催化剂相比。
Synthesis, structures, and photophysical properties of two Cu(I) complexes supported by <i>N</i>-heterocyclic carbene and phosphine ligands
作者:Xinhua Lou、Yunfei Tian、Zhiqiang Wang
DOI:10.1515/znb-2022-0092
日期:2022.9.27
Two new cationic four-coordinate Cu(I) complexes supported by different chelating N-heterocyclic carbene ligands and the diphosphine ligand bis[2-(diphenylphosphino)phenyl]ether (POP) have been synthesized. The chemical structures of both complexes have been characterized by 1H NMR, 13C NMR, 31P NMR, and mass spectroscopy, and the crystal structure of one complex has been determined by single-crystal
两种不同螯合支持的新型阳离子四配位Cu(I)配合物ñ-杂环卡宾配体和二膦配体双[2-(二苯基膦基)苯基]醚(POP)已被合成。两种配合物的化学结构均由1核磁共振氢谱,13C核磁共振,31P NMR、质谱和一种配合物的晶体结构已通过单晶 X 射线衍射确定。理论计算结果表明,这些配合物的最低能量电子跃迁主要是金属-配体电荷转移和配体-配体电荷转移跃迁。固态配合物显示出具有高光致发光量子产率的强烈发射。在 298 和 77K 的光物理行为表明,这些配合物在室温下的发射是热激活的延迟荧光与磷光混合。
One-Step Conversion of Azine <i>N</i>-Oxides to α-1,2,4-Triazolo-, 1,2,3-Triazolo, Imidazolo-, and Pyrazoloheteroarenes
作者:John M. Keith
DOI:10.1021/jo1001017
日期:2010.4.16
Pyridine, quinoline, isoquinoline, azaindole, and pyrimidine N-oxides were converted to their alpha-triazole and alpha-diazole derivatives by treatment with the corresponding p-toluenesulfonylazoles and Hunig's base at elevated temperatures.