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The highest initiation rate of any reported ruthenium-based catalyst was found for the new olefin-metathesis catalyst (H2IMes)(3-Br-py)2(Cl)2RuCHPh (1), which was synthesized in one step from commercially available reagents. Complex 1 is highly efficient for the cross metathesis of acrylonitrile, which is generally a poor substrate for metathesis reactions (e.g., see scheme). Mes=2,4,6-trimethylphenyl.
Love et al. (2002) studied this question.