Ni(i)–Ni(iii) cycle in Buchwald–Hartwig amination of aryl bromide mediated by NHC-ligated Ni(i) complexes?
Catalysis Science & Technology Pub Date: 2019-02-13 DOI: 10.1039/C8CY02427H
Abstract
Intermediate amide complexes of NHC-ligated monovalent nickel in Buchwald–Hartwig amination of aryl halides were isolated and structurally characterized. The amide complexes reacted with aryl bromide to form a cross-coupling product. Low-temperature observation of the oxidative addition product of the Ni(I) amide complex with aryl bromide indicated the presence of a Ni(III) intermediate. The results showed that a well-defined mononuclear NHC–Ni(I) complex can act as a key intermediate in homogeneous catalysis.
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Journal Name：Catalysis Science & Technology
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CAS no.: 89640-58-4
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