The C–H amination of electron-deficientarenes such as polyfluoroarenes and azole compounds with O-acylated hydroxylamines effectively proceeds in the presence of a copper catalyst even at room temperature to provide the corresponding anilines and aminoazoles in good yields.
The synthesis, isolation, and reactivity of a cationic, geometrically constrained σ3-P compound in the hexaphenyl-carbodiphosphoranyl-based pincer-type ligand (1+) are reported. 1+ reacts with electron-poor fluoroarenes via an oxidative addition-type reaction of the C–F bond to the PIII-center, yielding new fluorophosphorane-type species (PV). This reactivity of 1+ was used in the catalytic hydrodefluorination
Metallomimetic C–F Activation Catalysis by Simple Phosphines
作者:Sara Bonfante、Christian Lorber、Jason M. Lynam、Antoine Simonneau、John M. Slattery
DOI:10.1021/jacs.3c10614
日期:2024.1.24
only simple, cheap, and readily available trialkylphosphines without the need to enforce unusual geometries at phosphorus or use external oxidizing/reducing agents. Hydrodefluorination and aminodefluorination of a range of fluoroarenes was realized with good to very good yields under mild conditions. Experimental and computational mechanistic studies show that the phosphines undergo oxidative addition
在寻找廉价且丰富的催化元素取代昂贵、稀缺的贵金属时,从简单的 p 嵌段化合物中提供金属酰亚反应性是非常可取的。这一贡献表明,金属酰基催化,涉及 P(III) 和 P(V) 氧化态之间的简单氧化还原循环,只需使用简单、廉价且容易获得的三烷基膦即可实现,而无需在磷处强制实施不寻常的几何形状或使用外部氧化剂/还原剂。在温和条件下,实现了一系列氟芳烃的氢脱氟和氨基脱氟,产率从好到非常好。实验和计算机理研究表明,膦通过类似 Meisenheimer 的过渡态发生氟芳烃底物的氧化加成,形成氟膦。该溶液经过硅烷的假金属转移步骤,通过初始氟化物从 P 转移到 Si,得到实验观察到的鏻离子。然后,氢硅酸盐对离子的氢化物转移导致氢基磷烷,氢基磷烷发生还原消除产物以重整膦催化剂。这种行为类似于许多经典的过渡金属催化反应,因此是主族元素系统催化的功能和机理金属行为的罕见例子。至关重要的是,所使用的试剂价格便宜、在
Reactions of polyfluoroaromatic compounds with electrophilic agents in the presence of tris(dialkylamino)phosphines
作者:V. V. Bardin
DOI:10.1007/bf02505680
日期:1997.8
octafluorotoluene yield products of replacement of the fluorine atom by hydrogen at position 4. This process is accompanied by the side reaction of aminodefluorination. In the case of 3-H-heptafluorotoluene and octafluoronaphthalene, aminodefluorination is the main reaction. Reactions of perfluoro-4-isopropyltoluene, 4-H-heptafluorotoluene, and 4-methylheptafluorotoluene do not occur under the above-mentioned