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      Encapsulation of the Hoveyda–Grubbs 2nd generation catalyst in magnetically separable alginate/mesoporous carbon beads for olefin metathesis reactions in water

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      Author(s)
      Tunalı, Z.
      Sağdıç, Kutay
      İnci, Fatih
      Öztürk, B.Ö.
      Date
      2022-04-08
      Source Title
      Reaction Chemistry & Engineering
      Electronic ISSN
      2058-9883
      Publisher
      Royal Society of Chemistry
      Volume
      7
      Issue
      7
      Pages
      1617 - 1625
      Language
      English
      Type
      Article
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      Abstract
      In this study, nano-sized mesoporous carbon-supported HG2 and magnetic γ-Fe2O3 nanoparticles were encapsulated within calcium alginate gels using a one-pot procedure. Mesoporous carbon within the hydrophilic alginate shell provided hydrophobic compartments for hydrophobic olefinic substrates to conduct olefin metathesis reactions in water under an air atmosphere. Stable alginate/mesoporous carbon gel structures were obtained in the presence of a non-ionic surfactant (Tween20) with a homogenous distribution of HG2 in the gel matrix as confirmed by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis. The HG2 catalyst encapsulated in the alginate/mesoporous carbon matrix exhibited an improved performance in water, and quantitative yields were obtained in ring-closing metathesis reactions of diethyl diallylmalonate even in tap-water under the air atmosphere with no significant ruthenium and iron leaching. The catalyst can be easily separated from the reaction mixture with the aid of a magnet, and it can be reused up to 7 times in RCM reactions.
      Permalink
      http://hdl.handle.net/11693/111526
      Published Version (Please cite this version)
      https://doi.org/10.1039/D2RE00058J
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      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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