Dendritic Encapsulation – “Postsynthetic” Functionalizations of a Single Benzophenone Shielded by Shape‐Persistent Polyphenylene Dendrons

First‐ and second‐generation polyphenylene dendrimers were synthesized starting from benzophenone as core. Variation of the size and the density of the dendrimer shell resulted in different isolation of the cores. To investigate the effect of shielding upon the reactivity of the core, chemical functionalizations as well as the alkali‐metal reduction of the encapsulated benzophenone core were performed. The herein presented synthetic concept opens the way to spatially well‐defined spherical nanoparticles bearing a single isolated function in the center. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)