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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, Nasrin ; Tavakolizadeh, Maryam ; Hosseini, Seyed Hassan ; Pourjavadi, Ali ; Bennett, Craig

Polymer (Guilford), 2017-03, Vol.112, p.342-350 [Periódico revisado por pares]

Kidlington: Elsevier Ltd

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Título:
Tungstate-loaded triazine-based magnetic poly(Bis-imidazolium ionic liquid): An effective bi-functional catalyst for tandem selective oxidation/Knoevenagel condensation in water
Autor: Zohreh, Nasrin ; Tavakolizadeh, Maryam ; Hosseini, Seyed Hassan ; Pourjavadi, Ali ; Bennett, Craig
Assuntos: Active sites ; Alcohols ; Anions ; Bi-functional catalyst ; Catalysts ; Catalytic activity ; Chemical synthesis ; Condensates ; Condensation ; Condensation polymerization ; Fine chemicals ; Immobilization ; Ionic liquids ; Knoevenagel condensation ; Magnetic catalyst ; Malononitrile ; Nanocomposites ; Nitrogen ; Oxidation ; Selectivity ; Triazine ; Water
É parte de: Polymer (Guilford), 2017-03, Vol.112, p.342-350
Descrição: 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. [Display omitted] •Easy synthesis of WO42- decorated bi-functional heterogeneous catalyst.•Oxidation-condensation tandem reaction using 4 mol% tungstate catalyst/H2O2 in water.•High catalytic activity and excellent selectivity of the catalyst in water medium.•Easy separation (external magnet) and high reusability of the catalyst.
Editor: Kidlington: Elsevier Ltd
Idioma: Inglês

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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, Nasrin ; Tavakolizadeh, Maryam ; Hosseini, Seyed Hassan ; Pourjavadi, Ali ; Bennett, Craig

Kidlington: Elsevier Ltd

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