Bulky N-Heterocyclic Carbene IPr* in Selected Organo- and Transition Metal-Mediated Catalytic Applications

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• 作者：J谩nos Balogh ; Alexandra M. Z. Slawin ; Steven P. Nolan
• 刊名：Organometallics
• 出版年：2012
• 出版时间：April 23, 2012
• 年：2012
• 卷：31
• 期：8
• 页码：3259-3263
• 全文大小：314K
• 年卷期：v.31,no.8(April 23, 2012)
• ISSN：1520-6041

文摘

A series of studies were conducted to probe the stability and reactivity of a very sterically encumbered N-heterocyclic carbene. The X-ray structure of the NHC IPr* (IPr* = 1,3-bis(2,6-bis(diphenylmethyl)-4-methylphenyl)imidazol-2-ylidene) was determined. IPr* was used as an organocatalyst in transesterification reactions. Steric and electronic parameters characterizing IPr* were determined via the synthesis of a nickel-carbonyl complex, [Ni(CO)₃(IPr*)]. A related complex, [(Cp*)Ru(IPr*)Cl] (Cp* = 畏⁵-C₅Me₅), was prepared and characterized by X-ray crystallography, and its catalytic performance in the racemization of chiral alcohols is reported. The catalytic performance of the NHC and of its transition metal derivatives permit establishing the standing of this uniquely bulky member among the NHC family.