Phosphorohydrazidates phosphorylation

Phosphoryl trihydrazide, OP(NHNH2)3, is made from POCI3 and N2H4 (7.52). Whereas reaction (7.211) is favoured by near-anhydrous conditions, under aqueous conditions a ring compound is formed (7.215). On the other hand, the action of heat on diphenyl phosphorohydrazide is to produce the condensed compound (7.216), which can also be made by reaction (7.217). The chloro analogue of (7.217) is hydrolytically unstable, but the phenyl phosphonium salt can be prepared by reaction (7.218). 

Solid-liquid phase-transfer-catalyzed phosphorylation of hydrazine, preparation of dialkyl phosphorohydrazidates and N,N -bis[dialkoxyphosphoryl]hydrazines. 

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