The Formation of PO(ONa)(NH2)2 by the Hydrolysis of N3P3(NH2)6 in a Sodium Hydroxide Solution

It was found that diamidophosphate eould be formed by the hydrolysis of trimeric phospherus niuide diamide in a sodium hydroxide selutien, and the identification of the hydrolysis produet with the PO(ONa)(NHs)2 prepared by Stokes' methed, the rate constant of the hydrolysis, the reaction mechanism and the behavior of NsPs(NH2)e in an acid solution were investigated. In a 2 N NaOH solution NsP, NH2be was converted into PO(ONa)(NH2)2 by boiling it for 2hrs, An oily product was deposited by the addition of alcohol to the solution; as this had been separated from the mother liquor, it could be crystallized by the addition of alcohol, The atemic ratio of P to N in the resulting products was exactly 1: 2; however, the Na content was more than that calculated for PO(ONa)(NH2)2. lt was confirmed, from the results of the paper chromatogram, the ion-exchange chromatogram, the X-ray diffraction pattern and the IR spectra, that the hydrolysis product and the PO(ONa)(NH2)2 obtained by Stockes' methed weite the same. On the basis of the results of the chromatograms, NgPs(NH2)e was directly converted into PO(ONa)(NH2)2 by alkaline hydrolysis; no intermediates were found. The rate of the alkaline hydtolysis accorded with that of a first-order equation, and the activation energy of the reaction was 21 kcal/mol. On the other hand, NsPs(NH2)e in an aqueous acid solution was sucqessively hydrolyzed into ammonium orthophosphate via intermediates such as amidodiphosphates and amidophosphates.