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  • Title: Effects of NHC-backbone substitution on efficiency in ruthenium-based olefin metathesis.
    Author: Kuhn KM, Bourg JB, Chung CK, Virgil SC, Grubbs RH.
    Journal: J Am Chem Soc; 2009 Apr 15; 131(14):5313-20. PubMed ID: 19351207.
    Abstract:
    A series of ruthenium olefin metathesis catalysts bearing N-heterocyclic carbene (NHC) ligands with varying degrees of backbone and N-aryl substitution have been prepared. These complexes show greater resistance to decomposition through C-H activation of the N-aryl group, resulting in increased catalyst lifetimes. This work has utilized robotic technology to examine the activity and stability of each catalyst in metathesis, providing insights into the relationship between ligand architecture and enhanced efficiency. The development of this robotic methodology has also shown that, under optimized conditions, catalyst loadings as low as 25 ppm can lead to 100% conversion in the ring-closing metathesis of diethyl diallylmalonate.
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