Identification of the Active Catalyst for Nickel-Catalyzed Stereospecific Kumada Coupling Reactions of Ethers.
Identification of the Active Catalyst for Nickel-Catalyzed Stereospecific Kumada Coupling Reactions of Ethers.
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DOI:
10.1002/chem.202000215
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发表时间:
2020-03-09
期刊:
影响因子:
--
通讯作者:
Jarvo ER
中科院分区:
文献类型:
--
作者:
Dawson DD;Oswald VF;Borovik AS;Jarvo ER
A series of nickel complexes in varying oxidation states were evaluated as precatalysts for stereospecific cross-coupling of benzylic ethers. These results demonstrate rapid redox reactions of precatalysts, such that the oxidative state of the precatalyst does not dictate the oxidation state of the active catalyst in solution. These data provide the first experimental evidence for a Ni(0)-Ni(II) catalytic cycle for a stereospecific alkyl-alkyl cross-coupling reaction, including spectroscopic analysis of the catalyst resting state. Evaluation of nickel precatalysts in different oxidation states provided evidence for active Ni(0) species in a stereospecific alkyl-alkyl cross-coupling reaction.
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