The Design,Preparation Of Magnetic Nanoparticles Surpported Amine And Imidazole And Their Applications

The high pollution and energy consumption of organic chemical industry have prompted researchers to look for green methodology.Because of highly catalytic activity and good recovery via magnetie,magnetic nanoparticles supported catalysts have intrigued interests of chemists.Firstly,two magnetic nanoparticles supported A@MNPs and Im@MNPs were designed and prepared,followed by fully characterization of XRD,FT-IR,TEM,VSM,TGA and elemental analysis.Their loading amount were 0.75 mmol/g and 0.42 mmol/g,respectively.The catalyst A@MNPs was use in the Knoevenagel condensation of various ?-aromatic substituted methylene compounds and aromatic aldehydes under microwave irradiation and good to excellent product yields of 83 %-95 % was afforded.Moreover,the catalyst can be readily recovered by external magnetie and reused for 8 times without any obvious loss of catalytic activity.The mechanism was further investigated and verified by UV analysis.The phospha-Michael reaction of diethyl phosphate proceeded smoothly to give corresponding product yields of 75 %-90 % within 5 hours in presence of Im@MNPs.And its recyclability is also good.