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A series of aza-crown ether ionic liquids supported on magnetic Fe3O4@SiO2 core–shell particles were designed, synthesized and characterized by elemental analysis, TEM, TG and FT-IR. These new aza-crown ether complex cation ionic liquids were utilized as heterogeneous acidic catalysts in Friedel–Crafts alkylation and Hantzsch reaction in good yields under convenient reaction conditions. Moreover, these magnetic particle supported IL catalysts could be readily recovered by an external magnet and reused five times without obvious loss of activity.

Fe3O4@SiO2 supported aza-crown ether complex cation ionic liquids: preparation and applications in organic reactions

Fe₃O₄@SiO₂ supported aza-crown ether complex cation ionic liquids: preparation and applications in organic reactions