Synthesis of Carbosilane Dendrimers with Variable Distance between Branching Nodes

A principal possibility to synthetically control the distance between the branching nodes of poly­(propenylsilane) dendrimer molecules has been shown. This was achieved by performing a relatively simple procedureadding to the classic dendrimer building process a stage involving a bifunctional reagent: dimethylchlorosilane. As a result two series of carbosilane dendrimers with doubled node-to-node distance, from previously achieved, were synthesized which differed by the distribution pattern of terminal allyl groups. A sixth generation dendrimer with varied node-to-node distance in the core and periphery had been synthesized. These compounds were isolated by preparative LC and were characterized by ¹H, ¹³C, and ²⁹Si NMR, mass spectroscopy, and GPC. Their characteristic viscosities and hydrodynamic diameters were identified. A comparative analysis of properties of synthesized dendrimers and their counterparts from half the distance between the branch nodes had been performed