Mixed arsenic–phosphorus–nitrogen heterocycles: preparation of derivatives of 1,3,5,2λ5,6λ5,4λ5-triaza-arsatriphosphorine

Abstract

Ring-closure reactions occur when the linear phosphazene [(NH₂)Ph₂PNPPh₂(NH₂)]Cl and substituted arsenic(V) chlorides react leading to products containing a new heterocyclic system based on N₃P₂As rings. A hydrochloride salt, N₃(PPh₂)₂AsPh₂·HCl, has been isolated in which protonation occurs at a ring nitrogen atom, most probably that adjacent to the arsenic atom. Chloride attached to arsenic in the N₃P₂ As system is readily replaced by methoxy-or dimethylamino-groups.