Catalytic C-F Bond Activation of Perfluoroarenes by Tricoordinated Gold(I) Complexes
作者:Jin-Hui Zhan、Hongbin Lv、Yi Yu、Jun-Long Zhang
DOI:10.1002/adsc.201100843
日期:2012.5.21
We report the first example of gold catalyzing CF bondactivation for perfluoroarenes in the presence of silanes. Tricoordinated gold(I) complexes supported by Xantphos‐type ligands, such as Xantphos and tBuXantphos ligands, exhibit efficacy in the hydrodefluorination (HDF) of various types of perfluoroarenes. For [tBuXantphosAu(AuCl2)], the highest turnover number is up to 1000 in the HDF of pen
我们报告了在硅烷存在下金催化全氟芳烃的CF键活化的第一个例子。Xantphos型配体(如Xantphos和t BuXantphos配体)支持的三配位金(I)络合物在各种类型的全氟芳烃的加氢脱氟(HDF)中显示出功效。对于[ t BuXantphosAu(AuCl 2)],在五氟硝基苯与二苯基硅烷的HDF中,最高周转数高达1000。对官能团耐受性的检查表明,该金(I)催化方案与酮,酯,羧酸盐,炔基,烯基和酰胺基团正交,表明其在化学选择性C中的潜在应用F激活。机理研究表明,四配位的[L 2 Au] +和[LAu] +之间的平衡对于金催化剂的反应性很重要,这取决于Xantphos型配体的空间庞大基团。此外,对可能的反应路径的计算研究表明,金(I)阳离子直接氧化CF键可能是这些催化反应中的关键步骤。
π–π Interaction Assisted Hydrodefluorination of Perfluoroarenes by Gold Hydride: A Case of Synergistic Effect on C–F Bond Activation
between DMAP and perfluoroarenes was suggested by UV-vis spectral titrations, (1)H NMR spectroscopic studies, and DFT calculations. Moreover, (1)H and (19)F-NMR studies show that this π-π interaction promotes hydrogen transfer from [(NHC)AuH] to pyridyl N atom, resulting in C-Fbond cleavage. The interpretation of π-π interaction assisted C-Factivation is supported by the reduced activation barriers in
π-Complexation and C—H hydrogen bonding in the formation of colored cocrystals
作者:Eric Bosch、Bryce S. Moreno、Nathan P. Bowling
DOI:10.1107/s2053229623002231
日期:2023.4.1
crystal structures of the red 1:1 cocrystals formed from the isomeric pyridines 4- and 3-2-[4-(dimethylamino)phenyl]ethynyl}pyridine with 1-[2-(3,5-dinitrophenyl)ethynyl]-2,3,5,6-tetrafluorobenzene, both C14H4F4N2O4·C15H14N2, are reported. Intermolecular interaction energy calculations confirm that π-stacking interactions dominate the intermolecular interactions within each crystal structure. The close
本研究评估了电荷转移电子供体-受体 π-π 络合和 C—H 氢键形成有色共晶的潜在组合。由异构吡啶 4- 和 3-2-[4-(二甲氨基)苯基]乙炔基}吡啶与 1-[2-(3,5-二硝基苯基)乙炔基]- 形成的红色 1:1 共晶的晶体结构2,3,5,6-四氟苯,均为 C 14 H 4 F 4 N 2 O 4 ·C 15 H 14 N 2, 被报道。分子间相互作用能计算证实,π-堆积相互作用主导每个晶体结构内的分子间相互作用。Hirshfeld 表面计算揭示的紧密接触主要是 CH 与 N、O 和 F 原子的相互作用。