Modular and Selective Arylation of Aryl Germanes (C−GeEt
<sub>3</sub>
) over C−Bpin, C−SiR
<sub>3</sub>
and Halogens Enabled by Light‐Activated Gold Catalysis
作者:Grant J. Sherborne、Avetik G. Gevondian、Ignacio Funes‐Ardoiz、Amit Dahiya、Christoph Fricke、Franziska Schoenebeck
DOI:10.1002/anie.202005066
日期:2020.9
rapid and programmable construction of bi‐ or multiaryls. To this end, the next frontier of synthetic modularity will likely arise from harnessing the coupling space that is orthogonal to the powerful Pd‐catalyzed coupling regime. This report details the realization of this concept and presents the fully selective arylation of aryl germanes (which are inert under Pd0/PdII catalysis) in the presence of
Well-dispersed non-spherical PdNPs with a diameter of 39–45 nm supported on a TiO2–cellulose composite (PdNPs@TiO2–Cell) can be synthesized by a simple and clean route. The catalyst was well characterized by XRD, FE-SEM, EDS, and TEM techniques. The PdNPs have good dispersity on the TiO2–Cell support. This results in excellent catalytic activities for the synthesis of biphenyls, acrylates, acetylenes
可以通过简单干净的方法合成负载在TiO 2-纤维素复合材料(PdNPs @ TiO 2 -Cell)上的直径39-45 nm的分散良好的非球形PdNP。通过XRD,FE-SEM,EDS和TEM技术对催化剂进行了很好的表征。PdNP在TiO 2-电池载体上具有良好的分散性。这导致在较低温度下使用低Pd负载量(1 mol%)合成联苯,丙烯酸酯,乙炔和前手性酮具有出色的催化活性。碱的性质和用量,溶剂的性质,催化剂的用量和反应温度对PdNPs @ TiO 2活性的影响–对细胞进行了彻底的调查。该催化剂显示出至少四倍的可重复使用性,而没有降低催化活性。
[DE] VERFAHREN ZUR DURCHFÜHRUNG CHEMISCHER REAKTIONEN UNTER BETEILIGUNG VON AN FLUORIERTEN TRÄGERMATERIALIEN ÜBER FLUOR-FLUOR-WECHSELWIRKUNGEN ADSORBIERTEN VERBINDUNGEN<br/>[EN] METHOD FOR CARRYING OUT CHEMICAL REACTIONS INVOLVING COMPOUNDS ADSORBED ON FLUORINATED CARRIER MATERIALS BY MEANS OF FLUORINE-FLUORINE INTERACTIONS<br/>[FR] PROCEDE DE REALISATION DE REACTIONS CHIMIQUES EN PRESENCE DE COMPOSES ABSORBES SUR DES SUPPORTS FLUORES PAR INTERACTIONS FLUOR-FLUOR
申请人:UNIV ALBERT LUDWIGS FREIBURG
公开号:WO2004013068A1
公开(公告)日:2004-02-12
Die Erfindung betrifft ein Verfahren zur Durchführung einer chemischen Reaktion einer Verbindung B unter Beteiligung einer Verbindung A-F, wobei die Verbindung A-F an einem fluorierten Trägermaterial FT über Fluor-Fluor-Wechselwirkungen unter Bildung eines Adduktes (A-F):(FT) adsorbiert ist, dadurch gekenn-zeichnet, dass das Addukt (A-F):(FT) in einem geeigneten Lösungsmittel, welches die Verbindung B enthält, suspendiert wird, wordurch die Verbindung B unter Beteiligung der adsorbierten Verbindung A-F zu dem Reaktionsprodukt B' reagiert.
N,S-chelating triazole-thioether ligand for highly efficient palladium-catalyzed Suzuki reaction
作者:Qiong Yan、Lei Zheng、Miaomiao Li、Yunfeng Chen
DOI:10.1016/j.jcat.2019.07.004
日期:2019.8
1,2,3-Triazole-thioether compounds could serve as efficient ligands for Pd-catalyzed Suzuki reactions of various aryl iodides, bromides and chlorides. The reactions feature wide substrate scope and mild reaction conditions. Besides, shorter reaction time, lower catalyst loadings and quantitative yields with a turnover-frequency (TOF) value of up to 11,880 h−1 are other advantageous of this attractive
1,2,3-三唑-硫醚化合物可以用作钯催化的各种芳基碘化物,溴化物和氯化物的Suzuki反应的有效配体。该反应具有广泛的底物范围和温和的反应条件。此外,更短的反应时间,更低的催化剂载量和定量产率(TOF)值高达11,880 h -1的定量收率是该引人注目的方案的其他优点。晶体结构分析和计算研究表明,相应的螯合钯配合物的较高催化活性归因于较低的能隙和较低的氧化还原电势。
Synthesis of Heteroaryl Compounds through Cross-Coupling Reaction of Aryl Bromides or Benzyl Halides with Thienyl and Pyridyl Aluminum Reagents
moieties was provided through cross-coupling reactions of aryl bromides or benzyl halides with heteroarylaluminum reagents in the presence of Pd(OAc)2 and (o-tolyl)3P. The coupling reaction also worked efficiently with heteroaryl bromides affording series of heterobiaryl compounds. The reaction of phenylbromide with in situ prepared 3-pyridyl aluminum was demonstrated to afford the product 8a in high yield