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Tungstate-loaded triazine-based magnetic poly(Bis-imidazolium ionic liquid): An effective bi-functional catalyst for tandem selective oxidation/Knoevenagel condensation in water

Zohreh, N ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1016/j.polymer.2017.02.028
  3. Publisher: Elsevier Ltd , 2017
  4. Abstract:
  5. A novel bi-functional polymeric catalyst was synthesized by immobilization of tungstate anions onto the nitrogen rich poly(ionic liquid)/magnetic nanocomposite. The resulting catalyst has two types of catalytic sites: (i) immobilized WO4 anions with bis-imidazolium ionic liquid cation for selective oxidation of alcohols and (ii) basic amine groups for Knoevenagel condensation between produced aldehyde and malononitrile. Due to the polymeric nature of the catalyst, large amounts of tungstate and basic nitrogen groups were presented on the solid surface which led to a decrease in the applied catalyst mass for catalytic reaction. High catalytic activity and excellent selectivity of catalyst in water medium make this protocol a green way for production of fine chemicals. © 2017 Elsevier Ltd
  6. Keywords:
  7. Bi-functional catalyst ; Knoevenagel condensation ; Magnetic catalyst ; Oxidation ; Catalysis ; Catalyst activity ; Catalysts ; Catalytic oxidation ; Condensation ; Ionic liquids ; Liquids ; Negative ions ; Nitrogen ; Tungsten compounds ; Bi-functional catalysts ; Imidazolium ionic liquids ; Magnetic catalysts ; Poly(ionic liquid)s ; Polymeric catalysts ; Production of fine chemicals ; Selective oxidation ; Catalyst selectivity
  8. Source: Polymer (United Kingdom) ; Volume 112 , 2017 , Pages 342-350 ; 00323861 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0032386117301519