Journal
GREEN CHEMISTRY
Volume 14, Issue 1, Pages 201-208Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1gc16031a
Keywords
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Funding
- Natural Science Foundation of Jiangsu Province of China [BK2010485]
- Ministry of Education of China [20082881029]
- Nanjing University of Science and Technology [XKF09066]
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A novel magnetic nanoparticle supported dual acidic ionic liquid catalyst was synthesized by anchoring 3-sulfobutyl-1-(3-propyltriethoxysilane) imidazolium hydrogen sulfate onto the surface of silica-coated Fe3O4 nanoparticles. Due to the combination of nano-support features and flexible imidazolium linkers, it acted as a quasi-homogeneous catalyst to effectively catalyze the one-pot synthesis of benzoxanthenes by a three-component condensation of dimedone with aldehyde and 2-naphthol under solvent-free conditions. More importantly, the catalyst could be easily recovered by an external magnet and reused six times without significant loss of catalytic activity.
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