Mixed N-Heterocyclic Carbene/Phosphite Ruthenium Complexes: The Effect of a Bulkier NHC.
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- 作者：C茅sar A. Urbina-Blanco ; Xavier Bantreil ; Julia Wappel ; Thibault E. Schmid ; Alexandra M. Z. Slawin ; Christian Slugovc ; Catherine S. J. Cazin
- 刊名：Organometallics
- 出版年：2013
- 出版时间：November 11, 2013
- 年：2013
- 卷：32
- 期：21
- 页码：6240-6247
- 全文大小：442K
- 年卷期：v.32,no.21(November 11, 2013)
- ISSN：1520-6041
文摘
The synthesis, characterization, and catalytic activity of two new complexes, 2a,b, featuring a sterically demanding NHC and two different phosphites are described. Complexes 2a,b display a mutually trans arrangement of the 蟺-acidic phosphite and the strong 蟽-donor SIPr ligand (SIPr = N,N鈥?bis(2,6-diisopropylphenyl)imidazolin-2-ylidene). The synergy between the phosphite and the NHC ligand was revealed in the RCM of challenging substrates leading to tetrasubstituted olefins where, in comparison to their phosphine-containing analogues, 2a,b allowed higher conversions of these challenging substrates.