title: Immobilization of ruthenium in organic-inorganic hybrid copolymers: a reusable heterogeneous catalyst for oxidation of alcohols with molecular oxygen.
abstract: A novel organic-inorganic hybrid ruthenium (HB Ru) catalyst for the oxidation of alcohols with molecular oxygen has been developed. The catalyst was prepared from a polystyrene-based copolymer, which includes a trimethoxysilyl functionality, and dichlorotris(triphenylphosphine)ruthenium, [RuCl2(PPh3)3], as the metal source. A sol-gel process was employed for heterogenization of the catalyst. The choice of both ruthenium species and trialkoxysilyl-bearing monomers was found to be important for high catalytic activity. In the presence of HB Ru corresponding to 5 mol % loading of ruthenium, the alcohols were oxidized with molecular oxygen or air at atmospheric pressure without any additives to afford the corresponding aldehydes or ketones in good to excellent yields. The catalyst could be recovered and reused at least five times without loss of activity.
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, The HFRE Division, ERATO, Japan and Science Technology Agency, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Masaharu
authors.initials: M
authors.lastname: Ueno
authors.forename: Naiwei
authors.initials: N
authors.lastname: Wang
authors.forename: Shū
authors.initials: S
authors.lastname: Kobayashi
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D002384:Catalysis; D007287:Inorganic Chemicals / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D015394:Molecular Structure; D009930:Organic Chemicals / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*
chemical_list: D000438:Alcohols; D007287:Inorganic Chemicals; D009930:Organic Chemicals; D011108:Polymers; D012428:Ruthenium; D010100:Oxygen