A Borane Lewis Acid in the Secondary Coordination Sphere of a Ni(II) Imido Imparts Distinct C-H Activation Selectivity.
A Borane Lewis Acid in the Secondary Coordination Sphere of a Ni(II) Imido Imparts Distinct C-H Activation Selectivity.
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DOI:
10.1021/jacs.2c06662
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发表时间:
2022-08-31
影响因子:
15
通讯作者:
Szymczak, Nathaniel K.
中科院分区:
文献类型:
--
作者:
Wang, Baolu;Seo, Chris S. G.;Zhang, Cuijuan;Chu, Jiaxiang;Szymczak, Nathaniel K.
Two borane-functionalized bidentate phosphine ligands that vary in tether length have been prepared to examine cooperative metal-substrate interactions. Ni(0) complexes react with aryl azides at low temperature to form structurally unusual κ2-(N,N)-N3Ar adducts. Annealing these adducts affords products of N2 extrusion and in one case, a Ni-imido compound that is capped by the appended borane. Reactions with 1-azidoadamantane (AdN3) provide a distinct outcome, where a proposed nickel imido intermediate activates the sp2 C-H bonds of arenes, even in the presence of benzylic C-H sites. Combined experimental and computational mechanistic studies demonstrate that the unique reactivity is a consequence of Lewis-acid induced polarization of the Ni–NR bond, potentially providing a synthetic strategy for chemoselective reaction engineering.
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