Publication: Heterogeneous Pd/POSS Nanocatalysts for C–C Cross-Coupling Reactions
Issued Date
2018-01-01
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23656549
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2-s2.0-85044289020
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Mahidol University
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SCOPUS
Bibliographic Citation
ChemistrySelect. Vol.3, No.2 (2018), 753-759
Suggested Citation
Vetiga Somjit, Michel Wong Chi Man, Armelle Ouali, Preeyanuch Sangtrirutnugul, Vuthichai Ervithayasuporn Heterogeneous Pd/POSS Nanocatalysts for C–C Cross-Coupling Reactions. ChemistrySelect. Vol.3, No.2 (2018), 753-759. doi:10.1002/slct.201702597 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/45522
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Title
Heterogeneous Pd/POSS Nanocatalysts for C–C Cross-Coupling Reactions
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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.