Azido cyclophosphazenes

Thermolysis of organo azido phosphines produce organo cyclophosphazenes in high yields [25]. Recently, Guy Bertrand and coworkers have obtained a four membered cyclophosphazene [26-27] derivative, N2P2(NPr2)4 by photolyzing the corresponding azidophosphine (Eq. 12). 

Other inorganic metathetical exchange reactions studied include the replacement of bromine by fluorine and chlorine in N3P3Br6 and the preparation of azido-, cyano-, and isothiocyanatocyclophospha-zenes (21, 22, 249). In the reactions of N3P3C16 with KF and KSCN, addition of [18-Crown-6]ether considerably enhances the yields of substituted cyclophosphazenes, N3P3R6 (R = F, NCS) (449). 

Another approach for the preparation of organic polymers with cyclophos-phazene side groups involves the Staudinger reaction of an azido- substituted cyclophosphazene with a phosphine residue in an organic copolymer. Free-radical copolymerization of styrene with diphenyl-p-styrylphosphine yields... 

Increasing the munber of nitrogen atoms in heterocycles results in considerable gain in the standard enthalpy of formation in the resulting compounds. On the basis of this idea the synthesis and properties of cyclophosphazenes-containing azido and amino substituents on the phosphorus atoms were... 

---