Polybis(pyrrolyl)phosphazene

Current progress in the synthesis and properties of pyrrolylphosphazenes is summarized. The differences in reactivity of the cyclic trimer (NPCl 2 ) 3, and high polymer (NPCl 2 ) x, toward the pyrrolide nucleophile are discussed. Efforts to induce electronic conductivity in the polyphosphazenes are reviewed with particular emphasis on polybis(pyrrolyl)phosphazene.