N-Heterocyclic Carbene Bound Nickel(I) Complexes and Their Roles in Catalysis.
N-Heterocyclic Carbene Bound Nickel(I) Complexes and Their Roles in Catalysis.
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DOI:
10.1021/om200090d
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发表时间:
2011-05-09
期刊:
影响因子:
2.8
通讯作者:
Louie J
中科院分区:
文献类型:
--
作者:
Zhang K;Conda-Sheridan M;Cooke S;Louie J
New paramagnetic NiI(IMes)2X (IMes: 1,3-bis-(2,4,6-trimethylphenyl)-imidazol-2-ylidene) were prepared from the reaction of Ni(IMes)2 with aryl halides. Products that would arise from oxidative addition were not observed. In contrast, NiII(tmiy)2(X)(Ar) was formed from the oxidative addition of aryl halides to Ni bound by a sterically-less hindered NHC ligand, tmiy (tetramethylimidazol-2-ylidene). The paramagnetic NiI(IMes)2X complexes were compared to known Ni(0) and Ni(II) catalysts for Kumada and Suzuki coupling reactions. Stoichiometric reactions between the NiI(IMes)2X complexes with aryl halides and transmetallating agents were also evaluated.
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