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T=23°C; 24 h;

1: 49 percent / 30percent H2O2 / acetic acid / 18 h / 70 °C 2: 31 percent / 1) acetic anhydride, 2) aq. NaOH / 1) 18 h, reflux; 2) 5 h, reflux 3: 70 percent / POCl3 / 18 h / Heating 4: 76 percent / N2H4 / pyridine / 120 h / Heating 5: 79 percent / 24 h / 23 °C View Scheme

1: 31 percent / 1) acetic anhydride, 2) aq. NaOH / 1) 18 h, reflux; 2) 5 h, reflux 2: 70 percent / POCl3 / 18 h / Heating 3: 76 percent / N2H4 / pyridine / 120 h / Heating 4: 79 percent / 24 h / 23 °C View Scheme

1: 70 percent / POCl3 / 18 h / Heating 2: 76 percent / N2H4 / pyridine / 120 h / Heating 3: 79 percent / 24 h / 23 °C View Scheme

1: 76 percent / N2H4 / pyridine / 120 h / Heating 2: 79 percent / 24 h / 23 °C View Scheme