Fe 3 O 4 @Glycerol-Cu as a novel heterogeneous magnetic nanocatalyst for the green synthesis of 2-amino-4H-chromenes.

In the present study, the Fe 3 O 4 @Glycerol-Cu complex supported magnetically as a nanoparticle was prepared by grafting. Firstly, Fe 3 O 4 NPs were synthesized by FeCl 3 .6H 2 O and FeCl 2 .4H 2 O according to the reported method, and subsequently, the prepared MNP with 3-chloropropyltrimethoxysilane. After that, the support-glycerol was functionalized on the surface of MNP-(CH 2 ) 3 Cl for graft and stabilization of copper metal. Our purpose is to use the Fe 3 O 4 @Glycerol-Cu as a green, recoverable, novel, and affordable nanocatalyst in the effective synthesis of 2-amino-4H-chromenes. FT-IR, XRD, TGA, BET, VSM, TEM, and SEM-EDX techniques were examined to characterize this nanocatalyst. This result demonstrates that copper and organic compounds have appropriately reacted, with the support of MNP-(CH 2 ) 3 Cl, and the crystalline structure have preserved in the MNP-(CH 2 ) 3 Cl/Glycerol-Cu nanocatalyst confirmed the formation of the base Cu complex grafted on the surface of the nanoparticles. Finally, as can be seen, the nanoparticle size is 5-15 nm. This heterogeneous nanocatalyst illustrated excellent recyclable behavior, and can be used several times without notable reduction of its activity.