in not given saponification of (NH2)PO(OC6H5)2 with KOH; formation of the free acid by react. of the formed acidic K salt with HClO4;;

in water addn. of 125 g (NH2)PO(OC6H5)2 in a hot soln. of 140 g KOH in 280 ml H2O; boiling for 5 min; pptn. of KHPO3(NH2) on cooling and acidification with 50 percent CH3CO2H; dissolving 13.5 g KHPO3(NH2) washed with alc. and ether in 125 ml ice-water; filtration;; addn. of 100 ml 10 percent HClO4 on cooling with ice; filtration of pptd. KClO4 by vac., addn. of 700 ml alc. to the filtrate; pptn. of (NH2)PO(OH)2 after a longer period of time; filtration by vac.; washing with ether and alc., drying; recrystn. from H2O;;

in not given saponification of (NH2)PO(OC6H5)2 with KOH; formation of the free acid by react. of the formed acidic K salt with HClO4;;

in water addn. of 125 g (NH2)PO(OC6H5)2 in a hot soln. of 140 g KOH in 280 ml H2O; boiling for 5 min; pptn. of KHPO3(NH2) on cooling and acidification with 50 percent CH3CO2H; dissolving 13.5 g KHPO3(NH2) washed with alc. and ether in 125 ml ice-water; filtration;; addn. of 100 ml 10 percent HClO4 on cooling with ice; filtration of pptd. KClO4 by vac., addn. of 700 ml alc. to the filtrate; pptn. of (NH2)PO(OH)2 after a longer period of time; filtration by vac.; washing with ether and alc., drying; recrystn. from H2O;;