A simplified and convenient laboratory-scale preparation of 14N or 15N high molecular weight poly(dichlorophosphazene) directly from PCl5.
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.
Carriedo
Gabino A
GA
Dpto Química Orgánica e Inorgánica Facultad de Química, Universidad de Oviedo C/Julián Clavería S/N Oviedo 33071, Spain. gac@sauron-quimica.uniovi.es
García Alonso
Francisco J
FJ
Gómez-Elipe
Paloma
P
Fidalgo
J Ignacio
JI
García Alvarez
J L
JL
Presa-Soto
A
A