Functionalized NiFe2O4/mesopore silica anchored to guanidine nanocomposite as a catalyst for synthesis of 4H-chromenes under ultrasonic irradiation

A synergetic effect of nanocatalyst and ultrasonic irradiation was examined for the synthesis 4H-chromenes from benzaldehyde, cyclohexanone, malononitrile. It observed this contributory improved reaction that used highly pure products in short times highest yields. The nanocomposite includes guanidine anchored on to magnetic NiFe2O4 nanoparticles were as active base sonication compounds. product separated with simple filtration purify recrystallization by ethanol solvent. After completing reaction, a collected reused 6 runs model reaction. This has core very surface area shell. provided technique identified using FT-IR spectrum, scanning electron microscopy (SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), Brunauer–Emmett–Teller (BET). synthesized various derivatives under irradiation. organic 1H-NMR.