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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Electron- poor hemilabile dicationic palladium NHC complexes - synthesis, structure and catalytic activity
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Electron- poor hemilabile dicationic palladium NHC complexes - synthesis, structure and catalytic activity

机译:电子偏差的血液偏离钯NHC复合物 - 合成,结构和催化活性

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摘要

We present a new class of dicationic palladium NHC complexes with two carbene ligands bearing different aryl substituents and a hemilabile pyrimidyl group. They can either be synthesized from the imidazolium salts via the silver transmetalation route to a halide-free palladium(ii) precursor or by direct deprotonation by palladium acetate. For four complexes we could determine their solid-state structures by X-ray diffraction experiments. Insight gained by NMR spectroscopy and DFT calculations revealed that in solution the two potentially bidentate ligands interchange between chelating and non-chelating coordination modes. The preference of these coordination modes is governed by the steric influence of the different ligands. The complexes were shown to be active catalysts for the hydroarylation of alkynes, and their performance was rationalized by DFT calculations.
机译:我们提出了一类新的Daticic钯NHC络合物,其具有轴承不同芳基取代基和血红素嘧啶基的两种Carbene配体。 它们可以通过银色传递途径从咪唑鎓盐合成,以通过乙酸钯直接去质子化或通过直接去质子化来合成。 对于四个络合物,我们可以通过X射线衍射实验确定它们的固态结构。 通过NMR光谱和DFT计算获得的洞察力显示,在解决方案中,两个潜在的双齿配体在螯合和非螯合协调模式之间交换。 这些协调模式的偏好受不同配体的空间影响。 该配合物被证明是炔烃的水红化的活性催化剂,其性能通过DFT计算合理化。

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