Abstract
In recent years, dendrimers — a new class of engineered macromolecules — have attracted the interest of many research groups in chemistry and physics. The molecules are imitating on a nanometer scale a branching pattern present in nature on a macroscopic scale. They consist of repeat units, e.g. phenylacetylene molecules, arranged in a self-similar manner around a core. Two approaches for synthesizing dendrimers have been reported. One is the so called divergent approach, developed independently by Vogtle and Tomalia [1,2], where the dendrimer is built up divergently — generation by generation — from the core to the periphery. The other route due to Hawker and Frechet is called the convergent approach [3]. In the first step of this process the different branches are synthesized and in the last step they are connected with the core molecule.
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