was determined by single-crystal X-ray diffraction study. The catalytic activities of all palladium complexes were evaluated in the direct C-H bond arylation of the 2-acetylfuran and 2-acetylthiophene with (hetero) aryl bromides and readily available and inexpensive aryl chlorides in presence of 1 mol% catalyst loading at 120 °C. Under the given conditions, (hetero)aryl halides were successfully applied
synthesis of the PEPPSI (pyridine enhanced precatalyst preparation stabilization and initiation)‐themed, six new Pd‐complexes with the general formula [PdX2(NHC)(pyridine)]. The structures of all compounds were characterized by various spectroscopic techniques such as 1H NMR, 13C NMR and FT‐IR. The more detailed structural characterization of four of the complexes was determined by single‐crystal X‐ray
在这项研究中,合成了一系列苯并咪唑鎓盐作为不对称的N杂环卡宾(NHC)前体。苯并咪唑盐用于合成以PEPPSI(吡啶增强的前催化剂制剂的稳定和引发作用)为主题的六种新型Pd配合物,其通式为[PdX 2(NHC)(吡啶)]。所有化合物的结构均通过各种光谱技术进行了表征,例如1 H NMR,13C NMR和FT‐IR 通过单晶X射线衍射研究确定了四种配合物的更详细的结构表征。在负载量为1 mol%的情况下,在2-乙酰基呋喃和2-乙酰基噻吩与芳基溴的直接芳基化反应中,评估了所有Pd络合物的催化活性。
PEPPSI‐Type Palladium–NHC Complexes: Synthesis, Characterization, and Catalytic Activity in the Direct C5‐Arylation of 2‐Substituted Thiophene Derivatives with Aryl Halides
converted into the corresponding PEPPSI-type palladium-NHC complexes (3a-f) (PEPPSI= pyridine enhanced precatalyst preparation, stabilisation, and initiation). The structures of all compounds were characterized by 1H NMR, 13C NMR, IR and elemental analysis techniques, which supported the proposed structures. The molecular structure of the complex 3f was determined by single-crystal X-ray diffraction. The
by homogeneous Pd-catalyzed directarylation is an important research topic in modern organic chemistry. In this study, PEPPSI-type, (PEPPSI = Pyridine Enhanced Precatalyst Preparation Stabilization and Initiation), new Pd-catalysts with N-heterocyclic carbene ligand were synthesized, and they were used as catalysts in the synthesis of bi(hetero)arenes by directarylation process. The structures of
摘要 由于双(杂)芳烃在工业上的重要性,通过均相 Pd 催化直接芳基化合成这些化合物是现代有机化学中的一个重要研究课题。本研究合成了具有 N-杂环卡宾配体的新型 Pd 催化剂,PEPPSI 型(PEPPSI = Pyridine Enhanced Precatalyst Prepared Stabilization and Initiation),并将它们用作直接合成双(杂)芳烃的催化剂。芳基化过程。Pd-卡宾配合物的结构通过不同的光谱和分析技术,如NMR、FT-IR和元素分析来阐明。通过单晶 X 射线衍射研究确定了其中一种配合物的更详细的结构特征。
New benzimidazolium N-heterocyclic carbene precursors and their related Pd-NHC complex PEPPSI-type: Synthesis, structures, DFT calculations, biological activity, docking study, and catalytic application in the direct arylation
New benzhydryl-5,6-dimethyl-(3-methylbenzyl)benzimidazolium salt as N-heterocyclic carbene precursors and their relatednew Pd-NHC complex PEPPSI-type with the general formula [PdBr2(NHC)(pyridine)] were prepared and theoretically studied. Quantum chemistry computations at the B3LYP/6-311G(d,p)/LANL2DZ level were used to examine the molecular structure, electronic characteristics, and chemical reactivity