title: Self-Assembled Nanocomposite Organic Polymers with Aluminum and Scandium as Heterogeneous Water-Compatible Lewis Acid Catalysts.
abstract: While water-compatible Lewis acids have great potential as accessible and environmentally benign catalysts for various organic transformations, efficient immobilization of such Lewis acids while keeping high activity and without leaching of metals even under aqueous conditions is a challenging task. Self-assembled nanocomposite catalysts of organic polymers, carbon black, aluminum reductants, and scandium salts as heterogeneous water-compatible Lewis acid catalysts are described. These catalysts could be successfully applied to various C-C bond-forming reactions without leaching of metals. Scanning transmission electron microscopy analyses revealed that the nanocomposite structure of Al and Sc was fabricated in these heterogeneous catalysts. It is noted that Al species, which are usually decomposed rapidly in the presence of water, are stabilized under aqueous conditions.
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan).
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Miyamura
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan).
authors.forename: Arisa
authors.initials: A
authors.lastname: Sonoyama
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan).
authors.forename: Davit
authors.initials: D
authors.lastname: Hayrapetyan
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan). shu_kobayashi@chem.s.u-tokyo.ac.jp.
authors.forename: Shū
authors.initials: S
authors.lastname: Kobayashi
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D002384:Catalysis; D058116:Lewis Acids / Q000737:chemistry*; D017348:Microscopy, Electron, Scanning Transmission; D053761:Nanocomposites; D009930:Organic Chemicals / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012538:Scandium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D058116:Lewis Acids; D009930:Organic Chemicals; D011108:Polymers; D014867:Water; D000535:Aluminum; D012538:Scandium
keywords: CC coupling; Lewis acids; aluminum; heterogeneous catalysis; scandium