Studies of phosphazenes. Part 22. High-field nuclear magnetic resonance investigation of novel isomeric oxophosphazadienes

Abstract

The reaction of N₃P₃(NPPh₃)Cl₅ with an excess of methoxide yields the ‘hydroxy’-derivatives, N₃P₃(NPPh₃)(OMe)₄(OH) and N₃P₃(NPPh₃)(OMe)₃(OH)₂, in addition to the fully methoxylated derivative N₃P₃(NPPh₃)(OMe)₅. The analogous reaction of gem-N₃P₃(NPPh₃)(NMe₂)Cl₄ with methoxideaffords N₃P₃(NPPh₃)(NMe₂)(OMe)₄ and N₃P₃(NPPh₃)(NMe₂)(OMe)₃(OH). The ‘hydroxy’- derivatives exist in their oxophosphaza-tautomeric forms. For the ‘monohydroxy’-compounds, the presence of a pair of cis- and trans-oxophosphazadienes is established from ¹H and ³¹P n.m.r. spectroscopic data.