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首页> 外文期刊>Chemistry: A European journal >Directed C-H Halogenation Reactions Catalysed by PdII Supported on Polymers under Batch and Continuous Flow Conditions
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Directed C-H Halogenation Reactions Catalysed by PdII Supported on Polymers under Batch and Continuous Flow Conditions

机译：通过PDII指导C-H卤化反应在分批和连续流动条件下的聚合物上负载

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摘要

A new generation of N-heterocyclic carbene palladium( II) complexes containing vinyl groups in different positions in the backbone of the N-heterocycle have been developed. The fully characterised monomers were copolymerised with divinylbenzene to fabricate robust polymer supported NHC-Pd~(II) complexes and these polymers were applied as heterogeneous catalysts in directed C-H halogenation of arenes with a pyridine-type directing group. The catalysts demonstrated medium-high catalytic activity with up to 90% conversion and 100% selectivity in chlorination. They are heterogeneous and recyclable (at least six times) with no significant leaching of palladium in batch mode catalysis. The best catalyst was also applied under continuous flow conditions where it disclosed an exceptional activity (90% conversion) and 100% selectivity for the mono-halogenated product for at least six days, with no leaching of palladium, no loss of activity and an ability to maintain the original oxidation state of Pd~(II).
机译：已经开发出新一代含有N-杂环的不同位置的乙烯基的N-杂环脱甲钯（II）络合物。用二乙烯基苯共聚合，用二乙烯基苯共聚，以制造鲁棒聚合物负载的NHC-Pd〜（II）配合物，并将这些聚合物施加为具有吡啶型引导基团的引导的C-H卤化的异质催化剂。催化剂展示了中高催化活性，转化率高达90％和100％的氯化选择性。它们是异质和可回收的（至少六次），在批量模式催化中没有显着浸出钯。还在连续流动条件下施加最佳催化剂，其中它公开了卓越的活性（90％转化）和100％对单卤代产物的选择性至少六天，没有钯的浸出，无活性丧失和能力保持PD〜（II）的原始氧化状态。

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  • 来源
    《Chemistry: A European journal》 |2019年第59期|共7页
  • 作者

    Maitham H. Majeed; Payam Shayesteh; Per Tun; Axel R. Persson; Roman Gritcenko; L. Reine Wallenberg; Lei Ye; Christian Hulteberg; Joachim Schnadt; Ola F. Wendt;

  • 作者单位

    Centre for Analysis and Synthesis Department of Chemistry Lund University Box 124 221 00 Lund (Sweden);

    Division of Synchrotron Radiation Research Department of Physics Lund University Box 118 221 00 Lund (Sweden);

    Department of Chemical Engineering Lund University Box 124 221 00 Lund (Sweden);

    Centre for Analysis and Synthesis Department of Chemistry Lund University Box 124 221 00 Lund (Sweden);

    Centre for Analysis and Synthesis Department of Chemistry Lund University Box 124 221 00 Lund (Sweden);

    Centre for Analysis and Synthesis Department of Chemistry Lund University Box 124 221 00 Lund (Sweden);

    Centre for Applied Life Sciences Department of Chemistry Lund University Box 124 221 00 Lund (Sweden);

    Department of Chemical Engineering Lund University Box 124 221 00 Lund (Sweden);

    Division of Synchrotron Radiation Research Department of Physics Lund University Box 118 221 00 Lund (Sweden);

    Centre for Analysis and Synthesis Department of Chemistry Lund University Box 124 221 00 Lund (Sweden);

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用化学;
  • 关键词

    C-H activation; directed halogenation; flow catalysis; palladium; supported catalysts;

    机译：C-H激活;定向卤化;流量催化;钯;支持的催化剂;

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