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Title: Heterogeneous Pd/POSS Nanocatalysts for C–C Cross-Coupling Reactions
Authors: Vetiga Somjit
Michel Wong Chi Man
Armelle Ouali
Preeyanuch Sangtrirutnugul
Vuthichai Ervithayasuporn
ENSCM Ecole Nationale Supérieure de Chimie de Montpellier
Mahidol University
Keywords: Chemistry
Issue Date: 1-Jan-2018
Citation: ChemistrySelect. Vol.3, No.2 (2018), 753-759
Abstract: © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim An insoluble solid support of N−heterocyclic imidazolium-functionalized cage-like silsesquioxane (SQ); Bim-SQ, was synthesized by nucleophilic substitution of octakis(3-chloropropyl)octasilsesquioxane with an excess bis-(imidazol-1-yl)methane and investigated as a new organic-inorganic hybrid support. In the presence of Bim-SQ, Pd(II) from [PdCl4]2− can be stabilized via both electrostatic interactions and imidazole-N-coordination, giving an amorphous material of Pd(II)@Bim-SQ. Subsequent in situ reduction of Pd(II)@Bim-SQ during Suzuki−Miyaura cross-coupling reactions afforded monodispersed Pd nanoparticles (2.33 ± 1.50 nm) stablized on Bim-SQ support, PdNp@Bim-SQ with Pd loading up to 14% w/w. Catalytic studies revealed that the pre-catalyst Pd(II)@Bim-SQ was active heterogeneous catalyst for Suzuki−Miyaura cross-coupling reactions, having the maximum TOFs of 5400 h−1 under mild conditions and in aqueous ethanol medium. Furthermore, PdNp@Bim-SQ was also shown to be an efficient catalyst for Heck reactions. Simple catalyst recovery and reusability of PdNp@Bim-SQ for at least 5 catalytic cycles without loss of activity were also demonstrated.
ISSN: 23656549
Appears in Collections:Scopus 2018

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