Discovery and Elucidation of Counteranion Dependence in Photoredox Catalysis
作者:Elliot P. Farney、Steven J. Chapman、Wesley B. Swords、Marco D. Torelli、Robert J. Hamers、Tehshik P. Yoon
DOI:10.1021/jacs.9b01885
日期:2019.4.17
past decade, there has been a renewed interest in the use of transition metal polypyridyl complexes as photoredoxcatalysts for a variety of innovative synthetic applications. Many derivatives of these complexes are known, and the effect of ligand modifications on their efficacy as photoredoxcatalysts has been the subject of extensive, systematic investigation. However, the influence of the photocatalyst
Anti-Markovnikov Hydroamination of Unactivated Alkenes with Primary Alkyl Amines
作者:David C. Miller、Jacob M. Ganley、Andrew J. Musacchio、Trevor C. Sherwood、William R. Ewing、Robert R. Knowles
DOI:10.1021/jacs.9b08746
日期:2019.10.23
hydroamination of unactivated olefins with primary alkyl amines to selectively furnish secondary amine products. These reactions proceed through aminium radical cation (ARC) intermediates and occur at room temperature undervisiblelight irradiation in the presence of an iridium-based photocatalyst and an aryl thiol hydrogen atom donor. Despite the presence of excess olefin, high selectivities are observed for
Frontier orbitals of photosubstitutionally active ruthenium complexes: an experimental study of the spectator ligands’ electronic properties influence on photoreactivity
作者:Hyo Jin Jang、Samantha L. Hopkins、Maxime A. Siegler、Sylvestre Bonnet
DOI:10.1039/c7dt01540b
日期:——
characterization of [Ru(tpy)(R2bpy)(L)](X)n complexes (tpy = 2,2′:6′,2′′-terpyridine, R2bpy = 4,4′-dimethyl-2,2′-bipyridine (dmbpy), or 4,4′-bis(trifluoromethyl)-2,2′-bipyridine (tfmbpy), X = Cl− or PF6−, and n = 1 or 2) are described. The dmbpy and tfmbpy bidentate ligands allow for investigating the effects of electron-donating and electron-withdrawing ligands, respectively, on the frontier orbital energetics
A Systematic Study of the Effects of Complex Structure on Aryl Iodide Oxidative Addition at Bipyridyl‐Ligated Gold(I) Centers
作者:Jamie A. Cadge、John F. Bower、Christopher A. Russell
DOI:10.1002/anie.202108744
日期:2021.11.15
An assessment of the effects of complex structure on the oxidativeaddition mechanism of aryl iodides at bipyridyl-ligated AuI-centers is described. It is shown that the hemilability of the bipy ligand and the electropositivity of the Au-center are important factors, leading to facile oxidativeaddition with electron-poor ligands and electron-rich aryl iodides. These unusual observations contrast established
Bipyridine-Modulated Palladium-Catalyzed Oxidative Heck-Type Reactions of Arylboronic Acids with Olefins
作者:Chien-Ming Hsu、Chih-Bin Li、Chia-Hsing Sun
DOI:10.1002/jccs.200900129
日期:2009.10
We have demonstrated that 4,4′‐dimethyl 2,2′‐bipyridine as ligand for Pd(II) catalysts was very efficient for oxidativeHeck‐type coupling reaction of arylboronicacids with olefins in DMA or CH3CN under atm air at 80 °C. The presence of chelated bipyridine ligand isindispensable to achieve high reaction yields and to suppress the formation of biphenyl as homocoupled byproduct.