DiAmidophosphoric acid

Bismuthic acid, 0228 Boric acid, 0144 Bromic acid, 0248 Chlorosulfuric acid, 3997 Chromic acid, 4229 Diamidophosphorous acid, 4547... 

Dialuminium octavanadium tridecasilicide, 0088 Diamidophosphorous acid, 4542 4,4 -Diaminobiphenyl, see Benzidine, 3510... 

Diamidophosphorous Acid, (NH2)2POH, was made, together with diammonium phosphite, by the action of ammonia on phosphorous oxide dissolved in ether or benzene —... 

Diamidophosphoric Acid, (NH2)2PO(OH), is capable of giving salts of a tribasic acid, such as (NH2)2P(OK)2(OAg). Silver salts have been prepared in which hydrogen of the amido-group is replaced by silver, yielding ultimately the dark brown explosive (NHAg)2 P(OAg)3.2... 

In the Stokes method (I), the synthesis of diamidophosphoric acid starts from the phenyl ester of dlchlorophosphorlc acid obtained from POCI3 phenol. This Is converted with aqueous NHa to the phenyl ester of diamidophosphoric acid. This ester is then saponified with Ba(OH)3 the Ba is precipitated as BaCOa, and the silver salt of diamidophosphoric acid is then obtained by precipitation with AgNO 3. After repreclpitatlon of the silver salt, treatment with HBr results in very pure, free diamidophosphoric acid. The phenyl ester of diamidophosphoric acid can also be saponified with potassium hydroxide, and after acidification with acetic acid, the free diamidophosphoric acid can be precipitated with ethanol, yielding a somewhat less pure product (method II). 

A mixture of 95 g. of freshly distilled phenol and 160 g. of freshly distilled POCI3 Is refluxed until HCl evolution ceases (about eight hours). The product is distilled at 14 mm. and the fraction boiling at 115-120°C is collected. The oily liquid (approximately 180 g.) is added dropwise to 750 ml. of ice-cold, vigorously stirred concentrated ammonia. The precipitated phenyl ester of diamidophosphoric acid is rapidly filtered off, washed with ice water and dried on clay plates. A quantity (70-80 g.) of the crude ester Is recrystallized twice from 1000-1250 ml. of 95% ethanol. The m.p. of the pure ester is 188°C. 

C6H17N2O2P tetramethyl-diamidophosphoric acid ethyl ester 2404-65-1... 

A soln. of tosylhydrazine and Iriethylamine in dry dioxane added dropwise with stirring at 22-25 to a soln. of benzoylphosphoramidic dichloride in dioxane, stirring continued 3 hrs., a soln. of ethylenimine and triethylamine in dioxane added dropwise, and stirred 3 hrs. at room temp. N, N -ethylene-N"-benzoyl-diamidophosphoric acid tosylhydrazide. Y 91%. F. e. s. I. P. Titarenko, 2K. 46, 488 (1976) C. A. 85, 32587. 

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