Polybis phosphazene

Current progress in the synthesis and properties of pyrrolylphosphazenes is summarized. The differences in reactivity of the cyclic trimer (NPC12)3, and high polymer (NPC12)X, toward the pyrrolide nucleophile are discussed. Efforts to induce electronic conductivity in the polyphosphazenes are reviewed with particular emphasis on polybis (pyrrolyl) phosphazene. 

In similar nonequilibrium experiments, it has been shown that polybis(trifluoroeth-oxy)phosphazene (XXII) depolymerizes at temperatures above 150°C to yield [NP(OCH2CF3)2l3,4,5, higher cyclic oligomers and medium molecular weight open-chain polymers ... 

The c-DDP is attached to a preformed, water-soluble polymer, polybis(methyl-amino)phosphazene, I, that bears coordination sites on both the side-group and chain nitrogen atoms ". Compound I reacts with KjCPtClJ in organic media with 18-crown-6-ether yielding a coordination complex, II, containing c-DDP which shows tumor inhibitory activity . 

Many phosphazenes are known to depolymerize on heating but the evidence suggests that polybis(p-isopropylphenoxy)phosphazene is degraded by a random chain scission. This was attributed to the existence of cyclic transition states at the branch site locations. ... 

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