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American Chemical Society, Organometallics, 21(32), p. 6240-6247, 2013

DOI: 10.1021/om4004362

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Mixed N-Heterocyclic Carbene/Phosphite Ruthenium Complexes: The Effect of a Bulkier NHC.

Journal article published in 2013 by César Alejandro Urbina-Blanco, Xavier Bantreil, Julia Wappel, Thibault E. Schmid, Alexandra Mz Z. Slawin ORCID, Christian Slugovc, Catherine S. J. Cazin ORCID
This paper was not found in any repository; the policy of its publisher is unknown or unclear.
This paper was not found in any repository; the policy of its publisher is unknown or unclear.

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Abstract

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 pi-acidic phosphite and the strong sigma-donor SIPr ligand (SIPr = N,N'-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.