Carbon-carbon cross-coupling reactions catalyzed by a two-coordinate nickel(II)-bis(amido) complex via observable Ni(I) , Ni(II) , and Ni(III) intermediates.

Carbon-carbon cross-coupling reactions catalyzed by a two-coordinate nickel(II)-bis(amido) complex via observable Ni(I) , Ni(II) , and Ni(III) intermediates.
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DOI:
10.1002/anie.201404577
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发表时间:
2014-07-07
影响因子:
16.6
通讯作者:
Tilley, T. Don
Tilley, T. Don
中科院分区:
化学1区
文献类型:
--
作者:
Lipschutz, Michael I.;Tilley, T. Don

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最近,基于丰富的第一行金属,特别是镍,用于交叉偶联反应的更可持续的催化体系的开发引起了极大的兴趣。在这些反应中调用的关键中间体之一是一个NIII-烷基物种,但没有这样的物种,是一个主管催化循环的一部分,尚未被分离。在本文中,我们报告了一种基于双配位NiIII-双(酰胺基)络合物的碳-碳交叉偶联系统,其中NiIII-烷基物种可以被分离并完全表征。这项研究详细介绍了令人信服的实验证据所发挥的作用,这镍III-烷基物种以及其他关键镍和镍III中间体。本文所述的催化循环也是能够催化有机转化的双配位络合物的第一个实例之一,潜在地导致基于第一行过渡金属容纳双配位络合物的独特能力的一类新的催化剂。
Recently, the development of more sustainable catalytic systems based on abundant first‐row metals, especially nickel, for cross‐coupling reactions has attracted significant interest. One of the key intermediates invoked in these reactions is a NiIII–alkyl species, but no such species that is part of a competent catalytic cycle has yet been isolated. Herein, we report a carbon–carbon cross‐coupling system based on a two‐coordinate NiII–bis(amido) complex in which a NiIII–alkyl species can be isolated and fully characterized. This study details compelling experimental evidence of the role played by this NiIII–alkyl species as well as those of other key NiIand NiIIintermediates. The catalytic cycle described herein is also one of the first examples of a two‐coordinate complex that competently catalyzes an organic transformation, potentially leading to a new class of catalysts based on the unique ability of first‐row transition metals to accommodate two‐coordinate complexes.
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发表时间: 2013-10-30
影响因子: 15
作者:
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期刊: ORGANOMETALLICS
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