Functionalized NiFe۲O۴/mesopore silica anchored to guanidine nanocomposite as a catalyst for synthesis of ۴H-chromenes under ultrasonic irradiation

A synergetic effect of nanocatalyst and ultrasonic irradiation was examined for the synthesis of ۴H-chromenesfrom benzaldehyde, cyclohexanone, and malononitrile. It was observed this contributory improved the reactionthat was used for the synthesis of the highly pure products in short reaction times and highest yields. The nanocompositeincludes the guanidine anchored on to magnetic NiFe۲O۴ nanoparticles were used as the active basenanocatalyst for the sonication synthesis of ۴H-chromenes compounds. The product was separated with simplefiltration and purify with recrystallization by ethanol solvent. After completing the reaction, a nanocatalyst wascollected and reused in ۶ runs of model reaction. This nanocomposite has a magnetic core and a very active basesurface area shell. The nanocatalyst was provided by the simple technique and identified by using FT-IR spectrum,scanning electron microscopy (SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM),and Brunauer–Emmett–Teller (BET). This nanocomposite was used for the synthesized various derivatives of۴H-chromenes under ultrasonic irradiation. The organic products were identified by FT-IR and ۱H-NMR.

Keywords:

۴H-Chromena , Cyclohexanone , Malononitrile , Ultrasonic mesopore silica