Rapid “Mix-and-Stir” Preparation of Well-Defined Palladium on Carbon Catalysts for Efficient Practical Use
作者:Sergey A. Yakukhnov、Evgeniy O. Pentsak、Konstantin I. Galkin、Roman M. Mironenko、Vladimir A. Drozdov、Vladimir A. Likholobov、Valentine P. Ananikov
DOI:10.1002/cctc.201700738
日期:2018.4.24
A facile direct deposition approach for the preparation of recyclable Pd/C catalysts simply by stirring a solution of tris(dibenzylideneacetone)dipalladium(0) with a suitable carbon material was evaluated. An extraordinarily rapid catalyst preparation procedure (<5 min) under mild conditions and its excellent performance in cross‐coupling and hydrogenation reactions were demonstrated. The key point
评价了一种简单的直接沉积方法,该方法用于简单地通过搅拌三(二亚苄基丙酮)二钯(0)与合适的碳材料的溶液来制备可回收的Pd / C催化剂。证明了在温和条件下非常快速的催化剂制备程序(<5分钟)及其在交叉偶联和加氢反应中的优异性能。催化剂设计的关键是将Pd 0中心直接沉积在高度可及的表面积上,避免出现不确定的Pd II / Pd 0状态。
A 2-((4-Arylpiperazin-1-yl)methyl)phenol ligated Pd(<scp>ii</scp>) complex: an efficient, versatile catalyst for Suzuki–Miyaura cross-coupling reactions
作者:Srinivas Keesara、Saiprathima Parvathaneni
DOI:10.1039/c5nj03450g
日期:——
N,N,O-Tridentate palladium(ii) complex 4a was found to be an efficient catalyst for the Suzuki cross-couplingreaction of aryl halides (iodo-, bromo- and chloro-), which afforded cross-coupling products in good to excellent yields.
N,N,O-三齿钯 (ii) 配合物 4a 被发现是芳基卤化物(碘-、溴-和氯-)的 Suzuki 交叉偶联反应的有效催化剂,可提供良好的交叉偶联产物优良的产量。
Rapid threefold cross-couplings with sterically bulky triarylbismuths under Pd–Cu dual catalysis
作者:Maddali L. N. Rao、Ritesh J. Dhanorkar
DOI:10.1039/c5ra23311a
日期:——
The threefold cross-coupling reactivity of sterically highly demanding bulky triarylbismuths was addressed with task specific Pd–Cu dual catalytic conditions. In this study, an unprecedented hitherto unknown cross-coupling reactivity of sterically bulky triarylbismuths was demonstrated with a diverse range of aryl iodides and bromides. The intermediacy and in situ formation of arylcopper was probed
Visible-Light-Promoted, Catalyst-Free Gomberg–Bachmann Reaction: Synthesis of Biaryls
作者:Juyoung Lee、Boseok Hong、Anna Lee
DOI:10.1021/acs.joc.9b00557
日期:2019.7.19
Biaryls were synthesized via a novel visible-light-promoted Gomberg–Bachmann reaction that does not require a photosensitizer or any metal reagents. The formation of an electron donor–acceptor complex between aryl diazonium salts and pyridine allows, under visible-light irradiation, the synthesis of biaryls in moderate-to-high yields.
Heterogeneous chemoselective or stereoselective C–C coupling reactions remain extremely challenging in traditional organic synthesis. Here, we constructed a AuPd@N-rich carbon nitride (NRCN) photocatalyst through simple ammonia solution heat treatment of carbon nitride and then AuPd NP loading. AuPd@NRCN exhibited extraordinary light color promoted catalytic performance in C–Cbondformation under