N-donor functionalized N-heterocyclic carbene nickel(II) complexes in the Kumada coupling
作者:Joris Berding、Thomas F. van Dijkman、Martin Lutz、Anthony L. Spek、Elisabeth Bouwman
DOI:10.1039/b905036a
日期:——
novel nickel(II) complexes bearing two bidentate N-heterocyclic carbene ligands functionalized with anionic N-donor moieties are described. Two different N-donor groups are employed, namely amido and benzimidazolato moieties. The solid-state structures of three of these complexes have been determined by X-ray crystallography. The amido-functionalized low-spin, square-planar Ni(II) complexes exhibit
A Heteroleptic Palladium(II) Complex Containing a Bidentate Carbene/Amido Ligand and 3-(Trifluoromethyl)-5-(2-pyridyl)pyrazolate: Fast Catalyst Activation in the Heck Coupling Reaction
作者:Ming-Han Sie、Yuan-Hsin Hsieh、Yi-Hua Tsai、Jia-Rong Wu、Shih-Jung Chen、P. Vijaya Kumar、Jenn-Huei Lii、Hon Man Lee
DOI:10.1021/om100819q
日期:2010.12.13
photoelectron spectroscopy indicates the high electron richness of the palladium atoms in PdL(fppz). These palladiumcomplexes are efficient in catalyzing Heck coupling reactions with challenging aryl halide substrates. The catalyst activation in PdL(fppz) is significantly faster than that in cis-PdL2. A mere 0.5 mol % of palladium loading is enough to afford a 82% yield of coupled product from 4-chloroanisole
在K 2 CO 3存在下PdCl 2,fppzH和[LH 1 H 2 ] Cl之间的多组分反应(L =双齿酰胺基/卡宾; fppzH = 3-(三氟甲基)-5-(2-吡啶基)吡唑)可以制备高产率的PdL(fppz)。然而,类似的铂络合物需要通过两步程序来制备。通过1D和2D NMR光谱,X射线晶体学,电喷雾电离质谱和元素分析对新型钯(II)和铂(II)配合物进行了表征。X射线光电子能谱表明PdL(fppz)中钯原子的电子富集度很高。这些钯配合物可有效催化具有挑战性的芳基卤化物底物的Heck偶联反应。PdL(fppz)中的催化剂活化明显快于顺式-PdL 2中的催化剂活化。仅仅0.5mol%的钯负载量足以在24小时内从4-氯苯甲醚和苯乙烯获得82%的偶联产物收率。
Synthesis, structures, and antimalarial activities of some silver(I), gold(I) and gold(III) complexes involving N-heterocyclic carbene ligands
proligands and their corresponding silver(I), gold(I) and gold(III) complexes but also the new here described compounds were investigated in a chloroquine-resistant strain of Plasmodium falciparum, and against two Candida strains, respectively. For the first family, interesting antiplasmodial and antifungal activities were found for the dinuclear silver(I) species but they also showed strong hemolytic
Nickel(II) and Palladium(II) Complexes with Chelating N-Heterocyclic Carbene Amidate Ligands: Interplay between Normal and Abnormal Coordination Modes
作者:Kel Vin Tan、Jason L. Dutton、Brian W. Skelton、David J. D. Wilson、Peter J. Barnard
DOI:10.1021/om4000133
日期:2013.3.25
A series of six Ni(II) and Pd(II) complexes of two bidentate and two tetradentate N-heterocycliccarbene (NHC)/amidate ligands have been prepared. The complexes are uncharged, with square-planar coordination geometries, and the ligands are bound via the NHC groups and the deprotonated amide nitrogen atoms. Pd(II) complexes were prepared for the bidentate ligands, and in each case, two chelating bidentate