Improved synthesis of cyclic and polymeric phosphazenes based on facile chlorine substitution with phenols promoted by cesium carbonate

In this report we describe a very convenient synthetic method for the preparation in high yields and purity of cyclic [N 3 P 3 (OCH 2 CF 3 ) 6 ] and [N 3 P 3 (OC 6 H 4 R) 6 ] (R = Br, CN, CHO, COC 6 H 5 , COCH 3 , H, OCH 3 ), and polymeric [NP(OC 6 H 4 R) 2 ] n (R = Br, CHO, COC 6 H 5 , H, Bu t ) phosphazenes from the direct reaction of the trimer [N 3 P 3 Cl 6 ] or the high polymer [NPCl 2 ] n and the alcohol HOCH 2 CF 3 or the para ‐substituted phenols HOC 6 H 4 R, using Cs 2 CO 3 as proton abstractor and acetone or tetrahydrofuran as solvent.