Synthesis of new hybrid pyridines catalyzed by Fe3O4@SiO2@urea-riched ligand/Ch-Cl

Abstract

Herein, a new heterogeneous catalytic system through modification of urea functionalized magnetic nanoparticles with choline chloride [Fe3O4@SiO2@urea-riched ligand/Ch-Cl] was designed and synthesized. Then, the synthesized Fe3O4@SiO2@urea-riched ligand/Ch-Cl was characterized by using FT-IR spectroscopy, FESEM, TEM, EDS-Mapping, TGA/DTG and VSM techniques. After that, the catalytic usage of Fe3O4@SiO2@urea-riched ligand/Ch-Cl was investigated for the synthesis of hybrid pyridines with sulfonate and/or indole moieties. Delightfully, the outcome was satisfactory and the applied strategy represents several advantages such as short reaction times, convenience of operation and relatively good yields of obtained products. Moreover, the catalytic behavior of several formal homogeneous DESs was investigated for the synthesis of target product. In addition, a cooperative vinylogous anomeric-based oxidation pathway was suggested as rational mechanism for the synthesis of new hybrid pyridines.

Highly lubricative, self-healing, chemically degradable, anti-flaming and anti-irradiating magnetic gels simply prepared from binary mixtures of Fe3O4 nanoparticles and water

“…In contrast, a pH 12 magnetic gel possessed a weight retention of ∼66.5% even at 800 °C. Only three small derivative TG (DTG) peaks at around 104, 305 and 532 °C correlated to evaporation of water, pyrolysis of alkylamine and deoxygenation of Fe 3 O 4 , 26,43,44 respectively, can be discovered. Considering the relatively low boiling temperature of the water solvent (∼100 °C) and the relatively high temperature of the outer flame used in this study (400–500 °C), the anti-combustion performance should mainly be derived from the composite Fe 3 O 4 nano-gelators.…”