Unexpected Nickel Complex Speciation Unlocks Alternative Pathways for the Reactions of Alkyl Halides with dppf-Nickel(0).

Unexpected Nickel Complex Speciation Unlocks Alternative Pathways for the Reactions of Alkyl Halides with dppf-Nickel(0).
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DOI:
10.1021/acscatal.0c02514
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发表时间:
2020-09-18
期刊:
影响因子:
12.9
通讯作者:
Nelson DJ
Nelson DJ
中科院分区:
化学1区
文献类型:
--
作者:
Greaves ME;Ronson TO;Lloyd-Jones GC;Maseras F;Sproules S;Nelson DJ

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通过动力学和机理实验以及 DFT 计算研究了 dppf-Ni0 配合物与卤代烷之间的反应机理。活性物质是[Ni(κ2-dppf)(κ1-dppf)],它与烷基卤发生卤化物夺取反应,并快速捕获形成的烷基自由基。通过添加游离 dppf 配体,[Ni(COD)(dppf)] 与卤代烷的反应速率以及原型镍催化的卤代烷 Kumada 交叉偶联反应的产率显着提高。
The mechanism of the reactions between dppf-Ni0 complexes and alkyl halides has been investigated using kinetic and mechanistic experiments and DFT calculations. The active species is [Ni(κ2-dppf)(κ1-dppf)], which undergoes a halide abstraction reaction with alkyl halides and rapidly captures the alkyl radical that is formed. The rates of the reactions of [Ni(COD)(dppf)] with alkyl halides and the yields of prototypical nickel-catalyzed Kumada cross-coupling reactions of alkyl halides are shown to be significantly improved by the addition of free dppf ligand.
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