Graphene oxide immobilized Cu(II) Schiff base complex, GO@AF‐SB−Cu, was synthesized by the reaction of a Schiff base functionalized Graphene oxide, GO@AF‐SB, with Cu(OAc)2.H2O in ethanol under reflux. The immobilized complex was isolated as a black‐coloured solid and characterized by various physico‐chemical techniques, such as Fourier transform infrared spectroscopy (FT‐IR), Fourier transform Raman spectroscopy (FT‐Raman), Powder X‐ray diffraction (PXRD), X‐ray photoelectron spectroscopy (XPS), Field emission scanning electron microscopy (FESEM), Energy dispersive X‐ray microscopy (EDX), Elemental mapping, Inductively coupled plasma atomic emission spectroscopy (ICP‐AES) and Thermo gravimetric analysis (TGA). The catalytic activity of the complex was explored in Chan‐Lam coupling reaction of amines and arylboronic acids without using any co‐catalyst or oxidant. Further, the catalyst could be easily recovered quantitatively from the reaction mixture by simple filtration and reused up to five times without significant loss in the catalytic activity. All the isolated organic products were characterized by 1H and 13C NMR spectroscopy.
A copper‐triazine‐dendrimer‐functionalized graphene oxide (CTD‐GO) is synthesized for the first time. The structure of the dendrimer is confirmed by Fourier transform infrared (FT‐IR), Fourier transform (FT) Raman, powder X‐ray diffraction (PXRD), X‐ray photoelectron spectroscopy (XPS), energy‐dispersive X‐ray spectroscopy (EDX), field emission scanning electron microscopy (FESEM), high‐resolution transmission electron microscopy (HRTEM), elemental mapping, atomic absorption spectroscopy (AAS), and thermogravimetric analysis (TGA). The catalytic activity of the CTD‐GO is demonstrated in green synthesis of a series of propargylamine derivatives in high yields via A3‐coupling of aldehyde, alkyne, and amine in water. After the reaction, the catalyst was easily recuperated from the reaction mixture and reused up to four times without any significant loss in its catalytic activity. Operational simplicity, high yields of product, use of green solvent, facile recovery and recyclability of the catalyst, and easy workup are the salient features of this procedure.
Cu2O NPs immobilized on graphene oxide are used as a heterogeneous catalyst for the synthesis of a series of 1,2,4-triazoles and imidazo[1,2-a]pyridines under solvent-free conditions.
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