R-Allyl Nickel(II) Complexes with Chelating N-Heterocyclic Carbenes: Synthesis, Structural Characterization, and Catalytic Activity
R-Allyl Nickel(II) Complexes with Chelating N-Heterocyclic Carbenes: Synthesis, Structural Characterization, and Catalytic Activity
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DOI：
10.1021/om200937d
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发表时间：
2012-03-26
期刊：
影响因子：
2.8
通讯作者：
Valerga, Pedro
中科院分区：
文献类型：
--
作者：
Benitez Junquera, Lourdes;Carmen Puerta, M.;Valerga, Pedro
The N-heterocyclic carbene (NHC) nickel complexes [(L)Ni(NHC)][BAr4F] (Ar-F = 3,5-bis(trifluoromethyl)-phenyl; L = allyl (1), methylallyl (2); NHC = 1-(2-picolyl)-3-methylimidazol-2-ylidene (a), 1-(2-picolyl)-3-isopropylimidazol-2-ylidene (b), 1-(2-picolyl)-3-n-butylimidazol-2-ylidene (c), 1-(2-picolyl)-3-phenylimidazol-2-ylidene (d), 1-(2-picolyl)-3-methylbenzoimidazol-2-ylidene (e), 1-(2-picolyl)-4,5-dichloro-3-methylimidazol-2-ylidene (0) have been obtained in high yields and characterized by NMR spectroscopy. Furthermore, Id was unambiguously characterized by single-crystal X-ray crystallography. Complexes 1a-f/2a-f have shown catalytic activity toward dimerization and hydrosilylation of styrenes. In particular, 1a proved to be the most efficient catalyst in the dimerization of styrene derivatives in the absence of cocatalyst. Also, complexes 1a,d showed high selectivity and moderate to good yields in hydrosilylation reactions.
