synthesis of 5-arylmethylene-pyrimidine-2,4,6-trione and 2-arylidenemalononitriles derivatives using a new brønsted acid nano magnetic catalyst

In this work, 1-methyl imidazole-based ionic liquid stabilized on silica coated fe3o4 magnetic nanoparticles [nano-fe3o4@sio2@(ch2)3-1-methyl imidazole]hso4 as a new, efficient, and magnetic brønsted acid nano-magnetic catalyst was synthesized and characterized using various techniques including, fourier transform infrared spectrometer (ft-ir), scanning electron microscopy (sem), thermo gravimetric analysis (tga), x-ray diffraction patterns (xrd), and vibrating sample magnetometry (vsm). magnetic nanoparticles (mnps) were used to synthesize thr 5-arylmethylene-pyrimidine-2, 4, 6-trione derivatives by the one-pot condensation reaction between barbituric acid and various aldehydes in water at reflux conditions. similarly, 2-arylidenemalononitriles were synthesized by the one-pot of condensation reaction between various aldehydes and malononitrilein water as a green solvent at room temperature. this method has several advantages, such as short reaction times and high yields, non-using of toxic solvent, being eco-friendly benign, recyclability and reusability of the catalyst with external magnet for several time.