Ligand-accelerated non-directed C–H functionalization of arenes
作者:Peng Wang、Pritha Verma、Guoqin Xia、Jun Shi、Jennifer X. Qiao、Shiwei Tao、Peter T. W. Cheng、Michael A. Poss、Marcus E. Farmer、Kap-Sun Yeung、Jin-Quan Yu
DOI:10.1038/nature24632
日期:2017.11
challenges associated with the lack of sufficiently active palladium catalysts. Currently used palladium catalysts are reactive only with electron-rich arenes, unless an excess of arene is used, which limits synthetic applications. Here we report a 2-pyridone ligand that binds to palladium and accelerates non-directed C–H functionalization with arene as the limiting reagent. This protocol is compatible with
Imidazolyl-Functionalized Ordered Mesoporous Polymer from Nanocasting as an Effective Support for Highly Dispersed Palladium Nanoparticles in the Heck Reaction
FTIR spectroscopy. The material, which benefits from the use of entrapped ionicliquid in the prepared polymer matrix in combination with its ordered mesoporous structure, is an excellent environment for the stabilization of highly dispersed Pd nanoparticles to result in a recyclablecatalyst system with a significant activity in the Heck coupling reaction of aryl halides. The presence of well‐distributed
Palladium-Catalyzed <i>meta</i>-Selective C–H Functionalization by Noncovalent H-Bonding Interaction
作者:Guoshuai Li、Yifei Yan、Pengfei Zhang、Xiaohua Xu、Zhong Jin
DOI:10.1021/acscatal.1c02974
日期:2021.8.20
conventional directing template strategies via a covalent binding to the substrates are always hindered by prior stoichiometric installation and removal of the directing groups. Herein, we report a palladium-catalyzed meta-selective C–H olefination of aromatic carbonyl compounds by noncovalent hydrogen-bonding interaction. N,N′-Substituted ureas were engineered to serve as a H-bonding donor for binding
Flexible, dicationic imidazolium salts for<i>in situ</i>application in palladium-catalysed Mizoroki-Heck coupling of acrylates under aerobic conditions
作者:Marilyn Daisy Milton、Parul Garg
DOI:10.1002/aoc.3503
日期:2016.9
incorporating the features of both bidentate chelating O,O ligand and carbene, shows the maximum catalytic activity. A variety of aryl and heteroaryl methyl and ethyl cinnamates were synthesized using these imidazolium salts as preligands. In addition, NMRstudies confirm in situ generation of normal N‐heterocyclic carbenes from the C‐2 position of imidazol‐2‐ylidene ring. The mercury poisoning test was also