title: Ruthenium-catalyzed ring-closing metathesis accelerated by long-range steric effect.
abstract: Ruthenium-based metathesis catalysts with a N-heterocyclic carbene ligand bearing 2,3,4,5-tetraphenylphenyl moieties (1-TPPh and 1-TPPh*) are developed. The highly active catalyst system has been realized in THF by the combination of 1-TPPh* and CuCl as a phosphine scavenger.
authors.affiliation: Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.
authors.forename: Tetsuaki
authors.initials: T
authors.lastname: Fujihara
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Tomike
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Ohtake
authors.forename: Jun
authors.initials: J
authors.lastname: Terao
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Tsuji