[OH-:1].[Na+].CN(C(N=NC(N(C)C)=O)=O)C.Cl.[NH2:16]O.[C:18]1([P:24](Cl)([C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)=[O:25])[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1>O.O1CCOCC1>[NH2:16][O:25][P:24](=[O:1])([C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1A 5 L 4-neck round bottom flask (rbf) fitted with an overhead stirrer & a thermocouple was charged with; (1) a solution of NaOH (60.85 g, 1.52 mol, 2.4 eq) in 180 mL water, (2) a solution of hydroxylamine-HCl (110.12 g, 1.58 mol, 2.5 eq) in 180 mL water and (3) 180 mL dioxane. The mixture was cooled in an ice/acetone bath to 0° C. 150 g of ice was added, followed by a precooled (to about 10° C.) solution of diphenylphosphinic chloride (150.0 g, 0.634 mol, 1 eq) in 180 mL dioxane (added all at once). The reaction became very thick with a white precipitate, requiring vigorous stirring. The internal temperature rose to 22° C. After 5 additional minutes stirring (10 minutes maximum), the reaction mixture was diluted with 2.5 L of ice cold water and filtered thru a large fritted funnel (15 cm diameter). The crude material was left on the frit to drain for one hour, then transferred back into the 5 L rbf. The solid was suspended in 500 mL ice cold 0.25N NaOH solution and vigorously stirred for five minutes (no more than 10 min), then filtered again, washing 2× with ice cold water and left to dry overnight on the fritted filter. The partially dried material was dried for 12 h in a vacuum oven (50° C., 0.1 torr) and then well crushed with a mortar & pestal. An additional 16 h of drying in the vacuum oven afforded 122 g (82%) the above compound as a white powder.
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