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With potassium permanganate; potassium hydrogencarbonate; In water; at 5 - 20℃; for 19h;
Intermediate 59: Bis(1,1 -dimethylethyl) hydrogen phosphate potassium salt; A solution of bis(1 ,1-dimethylethyl) hydrogen phosphite (100 g, 515 mmol, Alfa Aesar) and potassium bicarbonate (30.9 g, 309 mmol) in water (800 ml) was cooled to 5 0C in an ice bath. To this mixture, potassium permanganate (57.0 g, 360 mmol) was added portionwise over 1 h maintaining the temperature below 20 0C. The reaction mixture was stirred at ambient temperature for 18 h. The reaction was heated to 60 0C and then filtered slowly through a pad of celite. The filtrate was evaporated in vacuo to give the title compound as a white solid (109.7 g); 1H NMR (d6-DMSO) delta 1.26 (18 H, s).