Synthesis, Characterization, and Ethylene Oligomerization of Nickel Complexes Bearing <i>N</i>-((Pyridin-2-yl)methylene)quinolin-8-amine Derivatives
作者:Wen-Hua Sun、Kefeng Wang、Katrin Wedeking、Dongheng Zhang、Shu Zhang、Jingjing Cai、Yan Li
DOI:10.1021/om700440v
日期:2007.9.1
A series of nickel complexes ligated by N-((pyridin-2-yl)methylene)quinolin-8-amine derivatives were synthesized by one-pot reaction of 8-aminoquinolines, 1-(pyridine-2-yl) ketones, and nickel halides and characterized by elemental and spectroscopic analyses along with X-ray diffraction analyses. These nickel complexes exhibit two kinds of structures, namely, dimeric with octahedral-coordinated geometry
A Facile Synthesis of Substituted 2-Alkylquinolines through [3 + 3] Annulation between 3-Ethoxycyclobutanones and Aromatic Amines at Room Temperature
作者:Gang Shan、Xiuyun Sun、Qian Xia、Yu Rao
DOI:10.1021/ol202334s
日期:2011.11.4
An efficient single-step approach toward the synthesis of 2-alkylquinolines is described. Through a Lewis acid mediated [3 + 3] annulation reaction between 3-ethoxycyclobutanones and aromatic amines, a variety of multisubstituted 2-alkylquinoline derivatives were prepared regioselectively at room temperature.
Manipulating electron transfer – the influence of substituents on novel copper guanidine quinolinyl complexes
作者:Joshua Heck、Fabian Metz、Sören Buchenau、Melissa Teubner、Benjamin Grimm-Lebsanft、Thomas P. Spaniol、Alexander Hoffmann、Michael A. Rübhausen、Sonja Herres-Pawlis
DOI:10.1039/d2sc02910c
日期:——
electron transfer properties of the corresponding coppercomplexes. Substituents with different steric or electronic influences were chosen. The effects on the properties of the coppercomplexes were studied applying different experimental and theoretical methods. The molecularstructures of the bis(chelate) coppercomplexes were examined in the solid state by single-crystal X-ray diffraction and in
铜胍喹啉基配合物由于其扭曲的结构而成为良好的实体态模型,导致 Cu() 和 Cu( II ) 配合物之间具有高度相似性。为了更好地理解电子转移的实体态原理,合成了一系列在2-和4-位具有不同取代基的胍喹啉基配体,以研究对相应铜配合物电子转移性质的影响。选择具有不同空间或电子影响的取代基。应用不同的实验和理论方法研究了对铜配合物性能的影响。通过单晶 X 射线衍射检查了固态双(螯合)铜配合物的分子结构,并通过 X 射线吸收光谱和密度泛函理论(DFT)计算检查了溶液中双(螯合)铜配合物的分子结构,揭示了取代基对复杂的结构。为了更好地了解配体和铜配合物的自然键轨道(NBO)计算。根据马库斯理论,通过测定电子自交换率来分析电子转移。获得的结果与配合物的结构分析和NBO计算的结果相关。尼尔森的四点法计算使人们对电子转移的热力学性质有了更深入的了解。这些研究揭示了取代基对铜络合物性能的显着影响。
Iron(II) and cobalt(II) complexes bearing N-((pyridin-2-yl)methylene)-quinolin-8-amine derivatives: Synthesis and application to ethylene oligomerization
作者:Kefeng Wang、Katrin Wedeking、Weiwei Zuo、Dongheng Zhang、Wen-Hua Sun
DOI:10.1016/j.jorganchem.2007.12.030
日期:2008.3
A series of tridentate N boolean AND N boolean AND N iron(II) and cobalt(II) complexes containing N-((pyridin-2-yl) methylene)-quinolin-8-amine derivatives were synthesized and characterized by elemental and spectroscopic analyses. The molecular structure of 1a was con. rmed by X-ray diffraction analyses. On treatment with modified methylaluminoxane, these metal complexes exhibited good catalytic activities up to 2.8 x 10(6) g mol(-1)(Fe) h(-1) for ethylene oligomerization, and butenes were the major products with nice selectivity for 1-C-4. The steric and electronic effects on catalytic activities of metal complexes were carefully investigated as well as the influence of various reaction parameters. In the catalytic system, Fe(II) complexes performed better catalytic activities than their Co(II) analogues. With ligands having bulky substituents, the better catalytic activity was observed in catalytic system of Fe(II) complex, however, the lower catalytic activity was obtained in catalytic system of Co(II) complexes. (C) 2008 Elsevier B.V. All rights reserved.