TetraSodium hypophosphate

According to Salzer, tetrasodium hypophosphate is obtained by neutralizing a solution of NagHaPgOg with NagCOg ... 

P20j[N(CH3)2]4 Octamethylpyro-phosphoramide, 7 73 P2O6 Phosphorus (V) oxide, 6 81 P20e(NH)Na4 Tetrasodium imido-diphosphate, 6 101 P206Na2H2-6H20 Disodium dihydrogen hypophosphate, 4 68 P2O7H4 Pyrophosphoric acid, 3 96, 97... 

Fully thioated hypophosphate derivatives are relatively stable and several well-characterised salts, M2P2S6, where M is a divalent metal, and MP2S< , where M is a tetravalent metal, are known [16,17]. These salts can be made by double decomposition from the soluble tetrasodium salt, which itself can be obtained from sodium sulphide and phosphorus trichloride. Some can be made by direct reaction between red P and metal or its sulphide (9.529,9.530). Many anions based solely on P and S are now known (Table 9.5) [42]. 

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