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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Palladium(II) complexes with chelating N-phosphanyl acyclic diaminocarbenes: synthesis, characterization and catalytic performance in Suzuki couplings
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Palladium(II) complexes with chelating N-phosphanyl acyclic diaminocarbenes: synthesis, characterization and catalytic performance in Suzuki couplings

机译：螯合N-膦酰基无环二氨基卡宾的钯（II）配合物：铃木偶联反应的合成，表征和催化性能

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摘要

Complexes of palladium(II) with newly disclosed, N-phosphanyl acyclic diaminocarbene ligands are synthesized for the first time and structurally characterized. The ligands coordinate palladium(II) in a chelating fashion, yielding remarkably stable complexes which can be stored without special precautions in the solid state. Related palladium(II) complexes with an isomerized chelating ligand, formed upon 1,2-migration of the phosphanyl group from the nitrogen to the adjacent carbon atom, have also been isolated in some instances and structurally characterized. The complexes efficiently act as precatalysts for Suzuki coupling reactions of aryl chlorides, where their productivity compares favourably with that of related palladium complexes with acyclic diaminocarbene ligands. In addition, the complexes show a distinct tendency to form as the byproduct the reductive homocoupling product of aryl chloride. This observation, together with ad hoc performed control tests, suggests that Pd colloids are involved in the formation of catalytically competent species.
机译：首次合成了钯（II）与N-膦酰基无环二氨基卡宾配体的配合物，并进行了结构表征。所述配体以螯合方式配位钯（II），产生显着稳定的络合物，无需特殊预防，即可以固态形式储存。在某些情况下，还已分离出具有膦酸酯基团从氮到相邻碳原子的1，2-迁移形成的具有异构化螯合配体的相关钯（II）配合物，并在结构上进行了表征。该络合物有效地充当芳基氯的Suzuki偶联反应的前催化剂，在这种情况下，它们的生产率可与具有无环二氨基卡宾配体的相关钯络合物的生产率相媲美。另外，该配合物显示出形成副产物形成芳基氯的还原均偶联产物的明显趋势。该观察结果以及临时进行的对照测试表明，Pd胶体参与了催化活性物质的形成。

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