Essay --

steps where addition of each iteration produces a higher generation of dendrimer (Tomalia and Frechet, 2001). The synthesis method used for dendrimer preparation abide almost entire control over the critical molecular(a) name parameters such as size, shape, surface/interior chemistry, flexibility, and topology. The dendrimers can be synthesized by using three different approach pathes (Crespo et al., 2005).1.Divergent approach2.Convergent approach3.Double stage convergent approachDivergent approach In this method, dendrimer grows outwards from a multifunctional core molecule towards periphery. As a forget of this growth, each new iterative reaction is characterized by the generation of an exponentially increasing number of functional groups on the periphery and double the molecular weight than the previous layer (Vogtle et al., 1978). The reaction steps can be repeated to increase the size of dendrimers as required. Many problems occur from brass reactions and incomplete rea ctions of the end groups that lead to structural defects. To prevent side reactions and for shutting o...