Mohammad Reza Nabid - Department of Chemistry, Shahid Beheshti University, G.C., P.O. Box 1983963113 Tehran, Iran
Yasamin Bide - Department of Chemistry, Shahid Beheshti University, G.C., P.O. Box 1983963113 Tehran, Iran

Since most uncharged organic molecules are simply insoluble in water, doing transition-metal-catalyzed organic synthesis in water is often not accessible. Employing amphiphiles with adefined structure is an approach that can overcome this problem. Due to the strong polarity gradient present betweenthe hydrophilic surface and the hydrophobic core of the micelle both nonpolar and polar reagents can be solubilized. This solubilization causes reactants to become moreconcentrated within the micelle than in the surrounding water phase and leads to an acceleration of the reaction [1,2 ]. Unimolecular micelles , which are systematically constructed dendrimers with hydrophilic interfaces, might be superior because of their dynamic stability and internalregularity [3]. Moreover dendrimer-encapsulated nanoparticles are prepared by making complex with metal ions within dendrimers andthen reducing the composite. The resulting immobilized nanoparticles can be nearly monodisperse in size and stable against aggregation and be catalytically active [4].