سید مجید هاشمی

Palladium and palladium complexes are used as catalyse in a variety of organic reactions. Palladium is especially used as catalyst in coupling reaction of two aromatic rings using various organometallic compounds and aryl halides. Although the coupling reactions proceed more efficiently in homogeneous catalytic systems, but the separation of catalyst is a difficulty at the end of the reaction. This problem is resolved using hettrogenized homogeneous catalytic reactions. In this thesis, Fe3O4 nanoparticles were prepared by coprecipitation method and covered with a layer of SiO2. 3-aminopropyltriethoxysilane was attached to it and palladium nanoparticles were prepared and attached on this supporty and characterized by FT-IR, SEM, XRD and EDAX methodes. These Pd (0) nanoparticles which can be easily separated using an extra magnet were used as an efficient catalyst for C-C coupling in Heck, Sonogashira and Suzuki reactions and also in C-N and C-S coupling reactions. Heck reaction took place between ethylacrylate and various arylhalides in the presence of a base and Pd catalyst. Sonogashira reaction took place between phenylacetylene and various arylhalides in the presence of cupper iodide and a base and Pd catalyst. Suzuki reaction was performed between phenylboronic acid and various arylhalides in the presence of a base and Pd catalyst. All the reaction showed 100% conversion. C-S coupling reaction between thiols and bromobenzene took place in the presence of a base and Pd catalyst with 100% conversion. C-N coupling reaction between amine compounds and bromobenzene took place in the presence of a base , Pd catalyst and TBAB with 100% conversion.