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In the present research, we introduce a simple and efficient method for the synthesis of a new heterogeneous nanocatalyst including [Fe 3 O 4 @SiO 2 -L-Cu(II)]  via  immobilizing Cu (II) on the surfaces of Fe 3 O 4 @SiO 2  nanoparticles (NPs). The prepared nanocatalyst was characterized by vibration sample magnetometer (VSM), EDS, X-ray diffraction (XRD), TGA, and Field emission scanning microscopy (FE-SEM) spectroscopic methods. The obtained magnetic nanocomposite showed excellent catalytic activity for the preparation of some chromene derivatives  via  a three-component reaction of aldehydes, 4‐hydroxycoumarin, and 2‐hydroxynaphthalene‐1,4‐dione. This synthetic procedure provides various benefits, including cost-saving, excellent yields in short reaction times (88–98%), low catalyst loading, and catalyst reusability.

Cu (II) Complex Stabilized on Fe 3 O 4 @SiO 2 Nanoparticles: An Effective and Recoverable Catalyst for the Preparation of Chromene Derivatives