Imidazole functionalized magnetic Fe3O4 nanoparticles as a novel heterogeneous and efficient catalyst for synthesis of dihydropyrimidinones by Biginelli reaction

Chloroaluminate Ionic Liquid Immobilized on Magnetic Nanoparticles as a Heterogeneous Lewis Acidic Catalyst for the Friedel–Crafts Sulfonylation of Aromatic Compounds

“…The diagram illustrated a slight weight loss of 7% below 300 °C, owing to the evaporation of adsorbed water. From 320–460 °C, a sharp decrease in weight observed (approximately 15%) was caused by the decomposition of imidazole moieties [ 61 ]. These results did not only confirm the fact that organic parts had been successful grafted on magnetic nanoparticles, but also determined the thermal stability of our catalyst up to 300 °C.…”

Synthesis of polyhydroquinolines and propargylamines through one-pot multicomponent reactions using an acidic ionic liquid immobilized onto magnetic Fe3O4 as an efficient heterogeneous catalyst under solvent-free sonication

“…Synthesis of LAIL@MNP LAIL@MNP was prepared according to a procedure reported previously in the literature. 78,79 The LAIL@MNP has been evaluated by FT-IR, Raman, TGA, SEM, TEM, ICP-OES, and EDS (please see in ESI †).…”

New nano-Fe3O4-supported Lewis acidic ionic liquid as a highly effective and recyclable catalyst for the preparation of benzoxanthenes and pyrroles under solvent-free sonication

“…The imidazolium chloride ionic liquid was synthesized pursuant to a procedure reported previously. 66 A mixture of 3-chloroethoxy-propylsilane (5.0 mmol, 1.2 mL) and imidazole (5.0 mmol, 0.34 g) was stirred at reflux for 17 h. The ionic liquid obtained as a yellowish viscous liquid was diluted in 50 mL of ethanol–water (1 : 1 volume ratio) solution. To the freshly prepared suspension of MNP material in 100 mL of 1 : 1 ethanol–water was added the above ionic liquid solution and the mixture was sonicated at 40 °C for 4 h. The resultant IL@MNP was washed with dichloromethane and dried at 70 °C in vacuo .…”