STUDIES OF PHOSPHAZENES PART XXVI: BI(CYCLOPHOSPHAZENES) CONTAINING A P[sbnd]O[sbnd]P BRIDGE

Abstract

Penta(phenoxy)chlorocyclotriphosphazene [N₃P₃ (OPh)₅Cl (1)] reacts with “(hydroxy)” phosphazenes, N₃P₃(OPh)₅(OH) (2), N₃P₃(OMe)₅(OH) (3) and gem-N₃P₃(NHBu^t)₂(OMe)₂(OH)(4) to give P[sbnd]O[sbnd]P bridged cyclophosphazenes, [N₃P₃(OPh)₅]₂O (5), [N₃P₃(OPh)₅]O[N₃P₃(OMe)₅] (6) and [N₃P₃(OPh)₅]O[N₃P₃(NHBu′)2(OMe)₃] (7) respectively. The products are characterised by IR and NMR spectroscopy and mass spectrometry. The P[sbnd]O[sbnd]P bridge of compound 5 is readily cleaved by various nucleophiles.