New ruthenium(II) carbonylcomplexes bearing pyridine carboxamide and triphenylphosphine/triphenylarsine/pyridine have been prepared by direct reaction of ruthenium(II) precursors with some pyridine carboxamide ligands, N,N-bis(2-pyridinecarboxamide)-1,2-ethane (H2L1), N,N-bis(2-pyridinecarboxamide)-1,2-benzene (H2L2) and N,N-bis(2-pyridinecarboxamide)-trans-1,2-cyclohexane (H2L3). The organic ligands
通过钌(II)前体与某些吡啶羧酰胺配体N,N -N-双(2-吡啶羧甲酰胺)-1,2-乙烷的直接反应,制得了带有吡啶羧酰胺和三苯基膦/三苯基ar /吡啶的新型钌(II)羰基配合物(H 2 L 1),N,N-双(2-吡啶甲酰胺)-1,2-苯(H 2 L 2)和N,N-双(2-吡啶甲酰胺)-反-1,2-环己烷(H 2 L 3)。提供两个N酰胺和两个N吡啶的有机配体金属中心的捐助地点。它们的特征在于元素分析,FT-IR,UV-Visible,NMR(1 H,13 C和31 P)和ESI-MS技术。根据上述数据,为所有配合物分配了八面体结构。在i PrOH / KOH存在下,络合物在酮转移加氢中的催化效率和在t存在下胺的N-烷基化对BuOK进行了检查。此外,通过DPPH自由基,一氧化氮自由基,羟基自由基和过氧化氢清除方法测定了配体及其钌(II)配合物的抗氧化活性,这表明钌(II)配合物比配体具有更有效的抗氧化活性。单独。
Sonochemical Preparation of Dipicolinamide Mn‐complexes and Their Application as Catalysts Towards Sono‐synthesis of Ketones
作者:Wael A. A. Arafa
DOI:10.1002/jhet.3518
日期:2019.4
Noteworthy, the presence of electron donors in the catalyst structure significantly increased the reaction yields. The substantial lowering of the oxidation reaction yields by adding ionol (2,6‐di‐tert‐butyl‐4‐methylphenol) as a free radical trap suggesting a free radical reaction pathway.
Aerobic Oxidation of Primary Amines to Imines in Water using a Cobalt Complex as Recyclable Catalyst under Mild Conditions
作者:Susanta Hazra、Priti Pilania、Mayukh Deb、Ajay Kishor Kushawaha、Anil J. Elias
DOI:10.1002/chem.201803251
日期:2018.10.22
Oxidative coupling of primary amines to imines has been achieved by using a water soluble cobalt complex as catalyst and air as the oxidant at near ambient conditions. Aromatic, heteroaromatic and aliphatic amines were successfully converted to the corresponding imines with yields of up to 96 %. A 20 gram scale reaction for the synthesis of imine from benzylamine in good yield is also demonstrated
伯胺与亚胺的氧化偶联已通过在近乎环境条件下使用水溶性钴配合物作为催化剂并使用空气作为氧化剂来实现。芳香族,杂芳香族和脂肪族胺已成功转化为相应的亚胺,产率高达96%。用该方法还证明了20克规模的反应,用于从苄胺以高收率合成亚胺。已经发现该催化剂可重复使用多达五个循环。它高效,周转率(TON)高达128,并显示化学选择性,唯一的副产物是水和氨。对照实验和机理研究表明,Co II / Co III催化循环负责这些氧化转化。该反应的一些反应性中间体也已经被分离和结构表征。
Comparative analysis of the electronic and EPR spectra of copper(II) and nickel(I) complexes; insights into nickel(I) electronic structure
作者:Mário Valente、Cristina Freire、Baltazar de Castro
DOI:10.1039/a800835c
日期:——
The nickel(I) complex with the ligand 1,2-bis(pyridine-2-carboxamido)benzene (H2bphen), generated by reduction with sodium amalgam of the homologous nickel(II) complex, has been studied by EPR and electronic spectroscopy. The electronic, structural and bonding properties of the complex were elucidated based on a comparison of the EPR and UV/VIS data of isoelectronic complexes of 63CuII and 61NiI of
镍(我)络合物与配位体1,2-双(吡啶-2-甲酰氨基)苯(H 2的BPhen),通过还原具有同源镍的钠汞齐产生(II)复合物,已经研究了通过EPR和电子光谱学。通过比较H 2 63 Cu II和61 Ni I的等电子配合物的EPR和UV / VIS数据,阐明了配合物的电子,结构和键合性质。bphen。对光谱数据的分析表明,该复合物在σ面内键合中表现出低价,在面外π键中表现出高价,并且能够分配≈13500和19 600 cm的电子带– 1的[镍我(的BPhen)] -对d XZ,d YZ ←d XY和d X 2 - ý 2 ←d XY转换。还介绍了辅助因子F 430系统的光谱表征的含义。
New cobalt, iron and chromium catalysts based on easy-to-handle N<sub>4</sub>-chelating ligands for the coupling reaction of epoxides with CO<sub>2</sub>
作者:M. Adolph、T. A. Zevaco、C. Altesleben、O. Walter、E. Dinjus
DOI:10.1039/c3dt53084a
日期:——
In this contribution, we report the successful utilization of several transition metal complexes based on substituted N4-N,N-bis(2-pyridinecarboxamide)-1,2-benzene chelating ligands as catalysts in the coupling of epoxides with carbon dioxide. The complexes were tested towards cyclohexene oxide and propylene oxide. Additionally the recyclability of the catalytic system was evaluated and a broader catalytic screening involving several commercially available epoxides was carried out with selected catalysts.