A Simplified and Convenient Laboratory-Scale Preparation of 14N or 15N High Molecular Weight Poly(dichlorophosphazene) Directly from PCl5

✍ Scribed by Gabino A. Carriedo; Francisco. J. García Alonso; Paloma Gómez-Elipe; J. Ignacio Fidalgo; J. L. García Álvarez; A. Presa-Soto

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 84 KB
• Volume: 9
• Category: Article
• ISSN: 0947-6539
• DOI: 10.1002/chem.200304750

✦ Synopsis

Abstract

A simple and convenient one‐pot synthesis of THF solutions of high molecular weight poly(dichlorophosphazene) [NPCl~2~]~n~, or the ^15^N isotopomer [^15^NPCl~2~]~n~, starting directly from PCl~5~ and NH~4~Cl or ^15^NH~4~Cl in a solution of 1,2,4‐trichlorobenzene in the presence of sulfamic acid and calcium sulfate dihydrate, is described. The solutions of [NPCl~2~]~n~ in THF, which are obtained free of poly(tetrahydrofuran) by preparing them in the presence of K~2~CO~3~, can be reacted directly with phenols, biphenols, or even HO‐CH~2~CF~3~ in the presence of K~2~CO~3~ or Cs~2~CO~3~ to obtain, after a very simple workup, the corresponding polyphosphazene derivatives almost free of chlorine.