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In this thesis, at first iron magnetic nanoparticles (Fe3O4) were synthesized by the co-precipitation method. The synthesized magnetic nanoparticles of iron were modified by Tryptophan and Creatinine as ligands. Then, some transition metals (Ni, Cu, Co, Fe, V, Zr, Ag) were immobilized on the F3O4. Synthesized catalysts were characterized by using various techniques such as XRD, FT-IR, SEM, EDX, ICP-OES, TGA and VSM methods. Fe3O4@Tryptophan@Ni, Fe3O4@Tryptophan@Cu, Fe3O4@Tryptophan@Co, Fe3O4@Tryptophan@Fe, Fe3O4@Tryptophan@VO, Fe3O4@Creatinine@Zr and Fe3O4@Creatinine@Ag catalysts have been efficiently applied for the preparation of sulfoxides from sulfides in the presence of hydrogen peroxide as oxidant at the room temperature. Also, oxidative coupling of thiols to disulfides has been occurred with Fe3O4@Tryptophan@Ni, Fe3O4@Tryptophan@Cu, Fe3O4@Tryptophan@Co and Fe3O4@Tryptophan@Fe as green catalysts in the presence of hydrogen peroxide as oxidant at the room temperature. The effect of ultrasonic irradiation on the yield and time of oxidation reaction of thiols and sulfides was investigated in the presence of Fe3O4@Tryptophan@Cu nanocatalyst. In another part of this thesis, the synthesis of tetrazoles was investigated with aromatic and aliphatic nitriles and sodium azide by [2 + 3] cycloaddition reaction in the presence of Fe3O4@Tryptophan@ Ni catalyst and green polyethylene glycol solvent and also Fe3O4@Creatinine@Zr and Fe3O4@Creatinine@Ag catalysts in the presence of water as a green and inexpensive solvent. Magnetic nanoparticles were used for several times without any significant change in activity. Easy synthesis, high separation of the catalysts by an external magnetic field and good reusability are catalytic activity, mild reaction conditions, eco-friendliness, ease of advantages of these magnetic nanocatalysts.
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