N-Heterocyclic Carbene Adducts of Cyclopalladated Ferrocenylpyridazine: Synthesis, Structural Characterization, and Application in ?-Arylation of Ketones with Aryl Chlorides
作者:Chen Xu、Hong-Mei Li、Zhi-Qiang Wang、Wei-Jun Fu、Yu-Qing Zhang、Bao-Ming Ji
DOI:10.1071/ch12035
日期:——
3-chloro-6-pyridazinylferrocene 1 and its N-heterocyclic carbene adducts 2–3 were synthesized and characterized by 1H NMR and IR spectroscopy, ESI-MS, and elemental analysis. Additionally, detailed structures of complexes 2–3 have been determined by single-crystal X-ray analysis. Complex 3 exhibited high catalytic activity for α-arylation of ketones with aryl chlorides. Typically, using 1 mol % catalyst in the presence
Di-<i>tert</i>-butylneopentylphosphine (DTBNpP): An Efficient Ligand in the Palladium-Catalyzed α-Arylation of Ketones
作者:Steven M. Raders、Jessica M. Jones、Jeffrey G. Semmes、Steven P. Kelley、Robin D. Rogers、Kevin H. Shaughnessy
DOI:10.1002/ejoc.201402474
日期:2014.11
palladium(II) acetate provide an efficient catalytic system for the α-arylation of ketones. Aryl bromides were coupled with ketones using 0.25–0.5 mol-% Pd(OAc)2/DTBNpP in toluene at 50 °C, whereas aryl chlorides required a higher catalyst loading (0.5–2.0 mol-%) and a higher temperature (80 °C). Coupling of 2-bromophenol with ketones using the Pd/DTBNpP system provides an efficient route for the synthesis
Highly Ambiphilic Room Temperature Stable Six-Membered Cyclic (Alkyl)(amino)carbenes
作者:Cory M. Weinstein、Glen P. Junor、Daniel R. Tolentino、Rodolphe Jazzar、Mohand Melaimi、Guy Bertrand
DOI:10.1021/jacs.8b05518
日期:2018.7.25
Cyclic (alkyl)(amino)carbenes with a six-membered backbone were prepared. Compared to their five-membered analogues, they feature increased % Vbur and enhanced donor and acceptor properties, as evidenced by the observed n → π* transition trailing into the visible region. The high ambiphilic character even allows for the intramolecular insertion of the carbene into an unactivated C(sp3)-Hbond. When used
制备了具有六元骨架的环状(烷基)(氨基)卡宾。与其五元类似物相比,它们具有增加的 Vbur 百分比和增强的供体和受体特性,正如观察到的 n → π* 跃迁尾随进入可见光区所证明的那样。高度的两亲性甚至允许将卡宾分子内插入到未活化的 C(sp3)-H 键中。当用作配体时,它们在钯介导的酮与芳基氯的 α-芳基化中胜过五元类似物。
Stable cyclic (alkyl)(amino) carbenes as ligands for transition metal catalysts
申请人:Bertrand Guy
公开号:US20070004917A1
公开(公告)日:2007-01-04
Stable carbene ligands are provided having a carbene center flanked by a quaternary carbon and an amino group, and having utility in the preparation of various transition metal complexes.
Base‐Ionizable Anionic NHC Ligands in Pd‐catalyzed Reactions of Aryl Chlorides
作者:Andrey Yu. Chernenko、Victoria A. Baydikova、Vadim V. Kutyrev、Alexander V. Astakhov、Mikhail E. Minyaev、Victor M. Chernyshev、Valentine P. Ananikov
DOI:10.1002/cctc.202301471
日期:2024.3.8
A new approach to designing NHC ligands that enables significant facilitation of unactivated aryl halide oxidative addition in Pd/NHC-catalyzed reactions has been developed. Innovative NHC ligands enhancing Pd-catalyzed arylchloridereactions are introduced. Leveraging steric and anionic properties, these 1,2,4-triazol-5-ylidene ligands improve efficiency in oxidative addition. Based on Nitron-type