Multifunctional Initiator with Platinum-Acetylide Dendritic Core for Living Polymerization of Isocyanides.

novel multifunctional initiator has been developed by peripheral modification of a Pt-acetylide dendrimer. Pd-Pt μ-ethynediyl units were introduced to the first-generation dendrimer by a divergent method. The dendritic initiator was applicable to the living polymerization of aryl isocyanides, producing high molecular weight polymers with a narrow polydispersity index in quantitative yields. The P NMR spectrum of the resulting polymer suggested that all Pd-Pt μ-ethynediyl units in the dendritic molecule actually functioned as an initiator. [ABSTRACT FROM AUTHOR]