title: Synthesis and activity of a new generation of ruthenium-based olefin metathesis catalysts coordinated with 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene ligands.
abstract: [formula: see text] A new family of 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene-substituted ruthenium-based complexes 9a-c has been prepared starting from RuCl2(=CHPh)(PCy3)2 2. These air- and water-tolerant complexes were shown to exhibit an increased ring-closing metathesis activity at elevated temperature when compared to that of the parent complex 2 and the previously developed complex 3. In many instances the activity of these complexes also rivaled or exceeded that of the alkoxy-imido molybdenum complex 1. Catalyst loadings of as low as 0.05 mol% could be used.
authors.affiliation: Arnold and Mabel Beckman Laboratory of Chemical Synthesis, California Institute of Technology, Pasadena 91125, USA.
authors.forename: M
authors.initials: M
authors.lastname: Scholl
authors.forename: S
authors.initials: S
authors.lastname: Ding
authors.forename: C W
authors.initials: CW
authors.lastname: Lee
authors.forename: R H
authors.initials: RH
authors.lastname: Grubbs
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D002384:Catalysis; D007093:Imidazoles / Q000737:chemistry*; D008024:Ligands; D012428:Ruthenium / Q000737:chemistry*
chemical_list: D000475:Alkenes; D007093:Imidazoles; D008024:Ligands; D012428:Ruthenium