تهیه مشتقات تترا هیدرو بنزو پیران در حضور نانو کاتالیزگر مغناطیسی جدید

Abstract

Abstract: In this study, a novel magnetic nanocomposite γ-Fe2O3@SiO2-Pr-NH-Triazine-NH-Benzimidazole-Cu was successfully synthesized by coating the surface of γ-Fe2O3 nanoparticles with silica and functionalizing them with 3-aminopropyltriethoxysilane, cyanuric chloride, aminobenzoimidazole, and copper chloride, respectively. The properties of the nanocomposite were characterized by various spectroscopic techniques such as FT-IR, XRD, FESEM, TGA, VSM, EDX, BET and ICP. The catalytic activity of this nanocomposite in the synthesis of tetrahydrobenzo[b]pyrans was demonstrated in a multicomponent reaction between benzaldehyde, dimedone, and malononitrile derivatives at 60°C in ethanol solvent. The products were produced in 15 minutes with 75-98% yield in the presence of this catalyst. The catalyst was easily separated from the reaction vessel by a magnet and its activity did not decrease significantly after six repeated uses in the reaction. Therefore, this catalyst can be used in the synthesis of heterocycles and organic compounds.