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 H-1, C-13, and Si-29 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.