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.