Syn thesis of magnetic nanoparticles Fe۳O۴-immobilized guanidine and its appli cation as nanocatal yst in cya nosilylation of aldeh ydes

Magnetic nanoparticles are efficient, readily available, high-su rface-area resulting in high catalyst loading capacity and outstandi ng stability heterogeneous supports for cataly sts.[۱] More important, magnetic se paration of the magnetic nanoparticles is more effective than FIltration or centrifugation,[۲] simple, eco nomical and promisin g for indust rial applications. Among the variou s magnetic nanoparticl es as the co re magnetic support, Fe۳O۴ nanoparticles are arguably the most extens ively studie d because of their sim ple synthesis, low cost , and relatively large magnetic su sceptibility. Recently preparation and applic ation of s everal supported catalyst s on magnetic Fe۳O۴ nanoparticles have been reported [۱]. The synthesis of novel and versatile magnetic n anocatalyst is interest i n catalysis r esearch.Mate rials and m ethods: Chemicals including starting materials, solvents and reagent were obtained from Merck chemical compan y and used w ithout purification. Appa ratus: Meltin g points w ere obtain ed in open capillary tubes and also were measured on the Electrothermal ۹ ۱۰۰ apparatus. FT-IR spectra we re recorde d on a Perkin Elmer RXI spectrometer. NM R spectra were record ed on a Bru ker Avance DPX ۲۵۰ MHz instrument.

کلیدواژه ها:

Magnetic nanocatalyst ، guani dine ، cyanosilylation ، aldehydes ،