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Keywords:

  • homogeneous catalysis;
  • metathesis;
  • N-heterocyclic carbene;
  • ruthenium;
  • scavenger

Abstract

Expedient routes are described to the three dominant ruthenium catalysts currently used for olefin metathesis: the second-generation Grubbs, Hoveyda, and indenylidene catalysts. Ligand exchange of the first-generation PCy3 complexes with isolated free H2IMes, followed by treatment with a cation- exchange resin to remove the liberated phosphine, affords the clean targets in ≥95 % isolated yield from commercially available precursors, with no workup other than filtration and evaporation.