ascorbic acid powder in methanol; water

1: 85 percent / formic acid (90percent), acetic anhydride / 3 h / Heating 2: NaOH, zinc dust / H2O; ethanol / 1 h / Heating 3: 78 percent / ammonium acetate, potassium ferricyanide / H2O; tetrahydrofuran / 240 h / 45 °C 4: 75 percent / ascorbic acid / H2O; methanol View Scheme

1: 90 percent / ceric ammonium nitrate / acetic acid / 0.5 h / Heating 2: 85 percent / formic acid (90percent), acetic anhydride / 3 h / Heating 3: NaOH, zinc dust / H2O; ethanol / 1 h / Heating 4: 78 percent / ammonium acetate, potassium ferricyanide / H2O; tetrahydrofuran / 240 h / 45 °C 5: 75 percent / ascorbic acid / H2O; methanol View Scheme

1: 19.5 g / CrO3 / acetic acid / 2 h 2: 75 percent / NaBH4, BF3 etherate / tetrahydrofuran 3: 90 percent / ceric ammonium nitrate / acetic acid / 0.5 h / Heating 4: 85 percent / formic acid (90percent), acetic anhydride / 3 h / Heating 5: NaOH, zinc dust / H2O; ethanol / 1 h / Heating 6: 78 percent / ammonium acetate, potassium ferricyanide / H2O; tetrahydrofuran / 240 h / 45 °C 7: 75 percent / ascorbic acid / H2O; methanol View Scheme

1: 75 percent / NaBH4, BF3 etherate / tetrahydrofuran 2: 90 percent / ceric ammonium nitrate / acetic acid / 0.5 h / Heating 3: 85 percent / formic acid (90percent), acetic anhydride / 3 h / Heating 4: NaOH, zinc dust / H2O; ethanol / 1 h / Heating 5: 78 percent / ammonium acetate, potassium ferricyanide / H2O; tetrahydrofuran / 240 h / 45 °C 6: 75 percent / ascorbic acid / H2O; methanol View Scheme

1: 85 percent / formic acid (90percent), acetic anhydride / 3 h / Heating 2: NaOH, zinc dust / H2O; ethanol / 1 h / Heating 3: 78 percent / ammonium acetate, potassium ferricyanide / H2O; tetrahydrofuran / 240 h / 45 °C 4: 75 percent / ascorbic acid / H2O; methanol View Scheme

1: 78 percent / ammonium acetate, potassium ferricyanide / H2O; tetrahydrofuran / 240 h / 45 °C 2: 75 percent / ascorbic acid / H2O; methanol View Scheme

1: NaOH, zinc dust / H2O; ethanol / 1 h / Heating 2: 78 percent / ammonium acetate, potassium ferricyanide / H2O; tetrahydrofuran / 240 h / 45 °C 3: 75 percent / ascorbic acid / H2O; methanol View Scheme