Reactivity of (bi-Oxazoline)organonickel Complexes and Revision of a Catalytic Mechanism.

Reactivity of (bi-Oxazoline)organonickel Complexes and Revision of a Catalytic Mechanism.
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DOI:
10.1021/jacs.1c07139
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发表时间:
2021-09-15
影响因子:
15
通讯作者:
Diao T
Diao T
中科院分区:
化学1区
文献类型:
--
作者:
Ju L;Lin Q;LiBretto NJ;Wagner CL;Hu CT;Miller JT;Diao T

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双恶唑啉(BIOX)是一种有效的配体骨架,用于促进镍催化的交叉偶联、交叉亲电偶联和光氧化还原-镍双重催化反应。这份报告填补了(BIOX)Ni络合物的有机金属反应性的知识空白,包括催化剂还原、氧化亲电活化、自由基捕获和还原消除。与其他螯合亚胺和恶唑啉配体不同,BIOX配体在(BIOX)Ni(I)配合物中没有表现出氧化还原活性。配体氧化还原活性的缺乏导致了(BIOX)Ni(II)配合物更负的还原电位,这也是锌和锰不能还原(BIOX)Ni(II)物种的原因。在这些结果的基础上,我们修正了以前提出的(BIOX)Ni催化交叉亲电偶联反应的“顺序还原”机理,排除了催化剂还原步骤。
Bi-Oxazoline (biOx) has emerged as an effective ligand framework for promoting nickel-catalyzed cross-coupling, cross-electrophile coupling, and photoredox-nickel dual catalytic reactions. This report fills the knowledge gap of the organometallic reactivity of (biOx)Ni complexes, including catalyst reduction, oxidative electrophile activation, radical capture, and reductive elimination. The biOx ligand displays no redox activity in (biOx)Ni(I) complexes, in contrast to other chelating imine and oxazoline ligands. The lack of ligand redox activity results in more negative reduction potentials of (biOx)Ni(II) complexes and accounts for the inability of zinc and manganese to reduce (biOx)Ni(II) species. On the basis of these results, we revise the formerly proposed “sequential reduction” mechanism of a (biOx)Ni-catalyzed cross-electrophile coupling reaction by excluding catalyst reduction steps.
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