An Efficient Synthesis of Dihydropyrano[3,2-<i>c</i>]chromene and Biscoumarin Derivatives Catalyzed by Ionic Liquid Immobilized on FeNi<sub>3</sub> Nanocatalyst

<p>In this research, a highly efficient method is described for the synthesis of dihydropyrano[3,2-<i>c</i>]chromenes and biscoumarins using ionic liquids (ILs) supported on nano-FeNi<sub>3</sub> as catalyst. The heterogeneous catalyst was fully characterized by X-ray diffraction (XRD), SEM, FT-IR, and vibrating sample magnetometer (VSM).</p>