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R-Allyl Nickel(II) Complexes with Chelating N-Heterocyclic Carbenes: Synthesis, Structural Characterization, and Catalytic Activity

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URI: http://hdl.handle.net/10498/20429

DOI: 10.1021/om200937d

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2012-R-allyl nickel(II) complexes with chelating N-heterocyclic carbenes. Synthesis, structural characterization, and catalytic activity.pdf (1.272Mb)
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Author/s
Benítez Junquera, Lourdes; Puerta Vizcaino, María del Carmen; Valerga Jiménez, Pedro Sixto
Date
2012-03
Department
Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
Source
Organometallics 2012, 31, 2175−2183
Abstract
The N-heterocyclic carbene (NHC) nickel complexes [(L)Ni(NHC)][BArF4] (ArF = 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 (f)) have been obtained in high yields and characterized by NMR spectroscopy. Furthermore, 1d 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.
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