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Keywords:

  • alkene ligands;
  • ligand effects;
  • olefin metathesis;
  • reaction mechanisms

Abstract

The development of a model system to study ruthenium–olefin complexes relevant to the mechanism of olefin metathesis has been reported recently. Upon addition of the ligand precursor 1,2-divinylbenzene to [RuCl2(Py)2(H2IMes)([DOUBLE BOND]CHPh)] (H2IMes=1,3-dimesityl-4,5-dihydroimidazol-2-ylidene), two ruthenium–olefin adducts are formed. Based on 1H NMR spectroscopy experiments and X-ray crystallographic analysis, these complexes are assigned as side-bound isomers in which the olefin and H2IMes ligands are coordinated cis to each other. Herein is reported an investigation of the generality of these observations through variation of the N-heterocyclic carbene ligand and the ligand precursor.