Synthesis, characterization, and catalytic application of Fe۳O۴/ethylmmonium tungestophosphate nano-composite inthe synthesis of Spiro[۴H-chromene-۴,۳'-indolin-۲-one]s

The magnetic nanoparticles of Fe۳O۴@C۲H۴NH۳ [Li۲PW۱۲O۴۰] were synthesized using a simple acidbasereaction between the heteropolyacid and the amine-functionalized nanoparticles. The resulting productcontains the conjugate dihydrogen base of the acid, bound by ionic forces to the amonium group on themagnetic scaffold. The catalytic activities of Fe۳O۴@C۲H۴NH۳ [Li۲PW۱۲O۴۰] and Fe۳O۴@C۲H۴NH۲were studied through their application in one-pot synthesis of some spiro[۴H-chromene-۴,۳'-indolin-۲-one]s.The synthesis was based on a three-component reaction, and the optimized conditions were achieved byexamining the effects of solvent, temperature, type, and amount of catalyst on the reaction time and yield ofthe model product.

کلیدواژه ها:

Magnetic Nanoparticles ، Heteropolyacid ، Catalyst ، Green Chemistry