Phosphazene

Phosphazenes refer to classes of organophosphorus compounds featuring phosphorus(V) with a double bond between P and N. One class of phosphazenes have the formula R−N=P(−NR₂)₃. These phosphazenes are also known as iminophosphoranes and phosphine imides. They are superbases.^[1] Another class of compounds called phosphazenes are represented with the formula (−N=P(−X)₂−)_n, where X = halogen, alkoxy group, amide and other organyl groups. One example is hexachlorocyclotriphosphazene (−N=P(−Cl)₂−)₃. Bis(triphenylphosphine)iminium chloride [Ph₃P=N=PPh₃]⁺Cl⁻is also referred to as a phosphazene, where Ph = phenyl group. This article focuses on those phosphazenes with the formula R−N=P(−NR₂)₃.