Magnetite-containing sulfonated polyacrylamide was easily prepared through polymerization of the corresponding monomers followed by the reaction with Fe 3 O 4 nanoparticles. The characterization of the obtained catalyst was performed by Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). The acidic SO 3 H moiety was found to be 1.1 mmol per gram of the obtained polymer. The catalytic activity of the polymer was examined for the synthesis of biscoumarin derivatives by two-component one-pot domino Knoevenagel-type condensation/Michael reaction between aldehydes and 4-hydroxycoumarin. Biscoumarins were obtained in high to excellent yields in short time. The work-up procedure of this reaction was very simple. The catalyst is stable (as a bench top catalyst) with easy-handling and it can be used again.
Magnetic Ag-Co and Ag-Ni alloy nanoparticles were prepared through a chemical reduction method using their corresponding [Co(NH 3) 6 ]Cl 3 and [Ni(C 2 O 4) 2 ]K 2 complexes, and AgNO 3. In this reaction, hydrazine monohydrate was used as reducing agent. The obtained nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). Ag-Co and Ag-Ni nanoalloys exhibited excellent catalytic performance in the preparation of 1,8-dioxooctahydroxanthenes from the reaction of 5,5-dimethyl-1,3-cycloheanedione (dimedone) with aromatic aldehydes. Catalysts were separated by an external permanent magnet and reused. Both, Ag-Co and Ag-Ni nanoalloys posess antibacterial and antioxidant properties and have no significant effect on DNA cleavage.
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