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Keywords:

  • metathesis;
  • N-heterocyclic carbenes;
  • olefins;
  • pyridine;
  • ruthenium

Abstract

The synthesis and characterization of two new ruthenium indenylidene complexes [RuCl2(SIPr)(Py)(Ind)] 6 and [RuCl2(SIPr)(3-BrPy)(Ind)] 7 featuring the sterically demanding N-heterocyclic carbene 1,3-bis(2,6-di isopropylphenyl)-4,5-dihydroimidazol-2-ylidene (SIPr) are reported. Remarkable activity was observed with these complexes in ring closing, enyne, and cross metathesis of olefins at low catalyst loadings. The performance of SIPr-bearing complexes 6 and 7 as well as [RuCl2(SIPr)(PCy3)(Ind)] 5 in ring opening metathesis polymerization is also disclosed. This work highlights the enormous influence of the neutral “spectator” ligands on catalyst activity and stability.