Synthesis of
<scp>
<i>N</i>
‐Heterocyclic
</scp>
Carbine Silver(I) and Palladium(
<scp>II</scp>
) Complexes with Acylated Piperazine Linker and Catalytic Activity in Three Types of C—C Coupling Reactions
salts LH2·Cl2 and LH2·(PF6)2 with acylated piperazine linker and two N‐heterocycliccarbene (NHC) silver(I) and palladium(II) complexes [L2Ag2](PF6)2 (1) and [L2Pd2Cl4] (2) were prepared. The crystal structures of LH2·Cl2 and 1 were confirmed by X‐ray analysis. In 1, one 26‐membered macrometallocycle was generated through two silver(I) ions and two bidentate ligands L. The catalytic activity of 2 was
Synthesis, structure and catalysis of a NHC–Pd(<scp>ii</scp>) complex based on a tetradentate mixed ligand
作者:Qing-Xiang Liu、Kang-Qing Cai、Zhi-Xiang Zhao
DOI:10.1039/c5ra11089k
日期:——
NHC–Pd(ii) complex 1 has been prepared. The catalytic activity of 1 in C–C coupling reactions was studied.
NHC-Pd(II)配合物1已经制备好。对1在C-C偶联反应中的催化活性进行了研究。
Synthesis of Pd(II) large dinuclear macrocyclic complex tethered through two dipyridine-bridged aza-crowns as an efficient copper- and phosphine-free Sonogashira catalytic reaction
first time the new 32-membered macrocyclic dinuclear palladium complex of two aza-crown macrocycles, bearing two pyridine arms, Pd2L2Cl4 was synthesized and characterized by elemental analysis, IR, NMR spectroscopy and single crystal X-ray diffraction methods. Pd2L2Cl4 was investigated as a moisture/air-stable catalyst for Sonogashira cross-coupling reaction in the absence of copper and phosphine ligand
首次合成了具有两个吡啶臂,Pd 2 L 2 Cl 4的两个氮杂冠大环的新的32元大环双核钯复合物,并通过元素分析,IR,NMR光谱和单晶X射线衍射进行了表征方法。在DMSO中不存在铜和膦配体的情况下,研究了Pd 2 L 2 Cl 4作为湿/气稳定催化剂用于Sonogashira交叉偶联反应的方法。Pd 2 L 2 Cl 4的有利特征是热稳定性,可能发生的串联反应,促进的催化性能以及协同效应。。通过使用Taguchi方法,确定了最佳条件(110°C,6 h,KOAc,2 mol%cat。)。此外,均相催化剂表现出良好的可重复使用性,直至四个循环。比较其他几种先前报道的Pd(II)双核配合物的催化活性,Pd 2 L 2 Cl 4具有反应时间短和热稳定性好的优点。
Direct synthesis of nitroaryl acetylenes from acetylenes and nitroarenes via oxidative nucleophilic substitution of hydrogen
作者:Robert Bujok、Mieczysław Mąkosza
DOI:10.1039/c6cc07475h
日期:——
Acetylenic carbanions add to nitroarenes: dinitrobenzenes, nitropyridines, etc to form [sigma]Hadducts that are subsequently oxidized by DDQ according to oxidative nucleophilic substitution of hydrogen (ONSH) pathway to give nitroaryl acetylenes.
ONO pincer type binuclear Pd(II) complex: Synthesis, crystal structure and catalytic utilization of the resulting organopalladium complex in catalytic copper-free Sonogashira coupling reaction
作者:Mojtaba Bagherzadeh、Narges-alsadat Mousavi、Maryam Zare、Sirous Jamali、Arkady Ellern、L. Keith Woo
DOI:10.1016/j.ica.2016.07.032
日期:2016.9
Abstract New binuclear palladium (II) complex featuring ONO pincer type hydrazone ligand was synthesized and characterized by spectroscopic and single-crystal XRD analysis. This complex showed excellent catalytic activity towards the copper-free Sonogashira cross coupling reaction. The main advantages over previous methodologies include low catalyst loading, less problematic reaction media (H2O–DMSO)