Palladium Supported on Metformin‐Functionalized Magnetic Polymer Nanocomposites: A Highly Efficient and Reusable Catalyst for the Suzuki–Miyaura Coupling Reaction. Issue 24 (17th November 2016)

• Record Type: Journal Article
• Authors: Yang, Pengbo; Ma, Rong; Bian, Fengling
• Is Part Of: ChemCatChem. Volume 8:Issue 24(2016)
• Page Start: 3746
• Page End: 3754
• Publication Date: 2016-11-17
• Subjects: heterogeneous catalyst -- nanocomposites -- palladium -- supported catalysts -- Suzuki coupling reactions; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201600994
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: In this paper, a novel magnetically responsive nanocatalyst, Pd/Fe3 O4 @PMAA‐Met (PMAA=poly(methacrylic acid), Met=metformin), has been successfully prepared by immobilizing palladium on the surface of metformin‐functionalized magnetic polymer nanocomposites. This novel nanocatalyst was characterized by FTIR, XRD, TEM, X‐ray photoelectron spectroscopy (XPS), and vibrating sample magnetometry (VSM). The prepared nanocatalyst showed excellent catalytic activity for Suzuki–Miyaura coupling reactions of aryl halides (I, Br, Cl) with arylboronic acids even at palladium loadings of 0.01–0.0007 mol % and the turnover frequency (TOF) reached up to 125 714 h −1 . The excellent activity of this Pd/Fe3 O4 @PMAA‐Met catalyst could be attributed to a "release and catch" catalytic mechanism as well as its nanometer size. This nanocatalyst could be simply separated with an external magnet and reused at least twelve times with excellent yields achieved. Abstract : Photo finish : A novel metformin‐functionalized magnetic polymer nanocomposite, Fe3 O4 @PMAA‐Met, was used as a support for palladium. The obtained catalyst was magnetically separable and highly active for the Suzuki–Miyaura reaction. The catalyst could be reused 12 times with excellent yields. A "release and catch" mechanism is shown to operate in the Suzuki reactions.