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.
Synthesis, characterization and catalytic activity of saturated and unsaturated N-heterocyclic carbene iridium(<scp>i</scp>) complexes
作者:Yung-Hung Chang、Ching-Feng Fu、Yi-Hong Liu、Shei-Ming Peng、Jwu-Ting Chen、Shiuh-Tzung Liu
DOI:10.1039/b814234c
日期:——
saturated and unsaturated N-benzyl substituted heterocyclic carbene (NHC) iridum(I) complexes were synthesized. The unsaturated carbene complex [(un-NHC-Bn)Ir(CO)2Cl] in the cis form was prepared via the carbene transfer from the corresponding silver complex to [Ir(COD)2Cl]2 followed by ligand substitution with CO, whereas the saturated complex was obtained via the transfer from (sat-NHC-Bn)W(CO)5. The treatment
Cyclometalated complexes are an important class of (pre)catalysts in many reactions including hydride transfer. The ring size of such complexes could therefore be a relevant aspect to consider while modulating their catalyticactivity. However, any correlation between the cyclometalating ring size and the catalyticactivity should be drawn by careful assessment of the pertinent geometrical parameters, and overall
Nickel(ii) N-heterocyclic carbene complexes as efficient catalysts for the Suzuki—Miyaura reaction
作者:S. B. Soliev、A. V. Astakhov、D. V. Pasyukov、V. M. Chernyshev
DOI:10.1007/s11172-020-2818-3
日期:2020.4
Catalytic activity of nickel(ii) and palladium(ii) N-heterocyclic carbene (NHC) complexes derived from imidazole, benzimidazole, and 1,2,4-triazole was comparatively evaluated in the cross-coupling reactions of aryl halides with arylboronic acids. Readily available nickel bis-NHC complexes (NHC)2NiX2 (X = Cl, Br, or I) exhibited the activity comparable to that of the structurally related palladium
在芳基卤化物与芳基硼酸的交叉偶联反应中,比较评估了衍生自咪唑、苯并咪唑和 1,2,4-三唑的镍 (ii) 和钯 (ii) N-杂环卡宾 (NHC) 配合物的催化活性。容易获得的镍双 NHC 配合物 (NHC)2NiX2(X = Cl、Br 或 I)表现出与结构相关的钯配合物相当的活性,因此可用作 Suzuki-Miyaura 反应的有效催化剂。
Mechanism studies of oxidation and hydrolysis of Cu(I)–NHC and Ag–NHC in solution under air
作者:Dazhi Li、Thierry Ollevier
DOI:10.1016/j.jorganchem.2019.121025
日期:2020.1
The decomposition of copper(I)–NHC and silver-NHC complexes in solution under air was studied. The Cu(I)–NHCs were oxidized into urea derivatives and hydrolysed into imidazoliums or benzimidazoliums. The decomposition of Ag–NHC with a saturated backbone led to ring-opening product, while the Ag–NHC with an unsaturated backbone led to imidazolium and Ag-bisNHC complex. The effects of steric property