Green and efficient Beckmann rearrangement by Cu(II) contained nano‐silica triazine based dendrimer in water

Abstract

AbstractIn this research, a Cu(II) contained nano‐silica triazine based dendrimer was prepared, characterized, and utilized as a retrievable catalytic system (Cu(II)‐TrDen@nSiO2) for green formation of primary amides in water at room temperature. The structure of nanoparticles was fully characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy‐dispersive X‐ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FT‐IR), and thermogravimetry analysis (TGA). The results revealed that the nanoparticles have spherical morphology and an average size of around 40 nm. The analysis also illustrated that the copper nanoparticles had been successfully loaded on the nitrogen‐rich dendritic structure with a uniform distribution. The inductively coupled plasma analysis showed that about 0.67 mmol/g of Cu was loaded on the Cu(II)‐TrDen@nSiO2support. Mild reaction conditions, excellent yields, environment‐friendly synthesis, and easily prepared starting materials are the key features of the present method. The catalyst is easily removed from the reaction media using a simple filtration and can be re‐used at least five times without any considerable loss of its catalytic activity.