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In this study, a convenient, appropriate and eco-friendly method for the   synthesis of quinoline derivatives via Friedländer reaction has been   developed by using ZrO2/Fe3O4-MNPs as an effective and reusable heterogeneous   catalyst. The morphology of ZrO2/Fe3O4-MNPs has been studied by XRD, FT-IR,   SEM, TEM and VSM techniques. Green procedure, straight and easy work-up, high   yields of the products and good reaction times are the benefits of this   procedure. Further, the catalyst can be recovered by external magnetic field   and reused at least for three times without a considerable decrease in its   catalytic activity

journal of the serbian chemical society

Preparation and characterization of ZrO2 supported Fe3O4 MNPs as an effective and reusable superparamagnetic catalyst for the riedländer synthesis of quinoline derivatives