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A Simplified and Convenient Laboratory‐Scale Preparation of 14 N or 15 N High Molecular Weight Poly(dichlorophosphazene) Directly from PCl 5
Author(s) -
Carriedo Gabino A.,
García Alonso Francisco. J.,
GómezElipe Paloma,
Fidalgo J. Ignacio,
García Álvarez J. L.,
PresaSoto A.
Publication year - 2003
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200304750
Subject(s) - tetrahydrofuran , chemistry , polyphosphazene , nuclear chemistry , chlorine , sulfamic acid , inorganic chemistry , medicinal chemistry , organic chemistry , polymer , solvent
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.