1: 235 g / K2CO3 / acetone / 20 h / Heating 2: 82 g / polyphosphoric acid (84percent P4O10) / 16 h / 130 °C View Scheme

1: O3 / acetic acid; H2O / 16 h / 15 °C 2: 61 percent / acetic acid; H2O / 60 h / 95 °C 3: 78 percent / NaOH, 30percent H2O2 / H2O / 2 h / 25 - 40 °C 4: 70 percent / NaOH / dimethylsulfoxide / 2 h / Heating View Scheme

1: O3 / acetic acid; H2O / 16 h / 15 °C 2: 61 percent / acetic acid; H2O / 60 h / 95 °C 3: 78 percent / NaOH, 30percent H2O2 / H2O / 2 h / 25 - 40 °C 4: 70 percent / NaOH / dimethylsulfoxide / 2 h / Heating 5: 1.) POCl3 / 1.) 40-45 deg C, 45 min, 2.) r.t., 16 h, then 70 deg C, 6 h View Scheme

1: O3 / acetic acid; H2O / 16 h / 15 °C 2: 61 percent / acetic acid; H2O / 60 h / 95 °C 3: 78 percent / NaOH, 30percent H2O2 / H2O / 2 h / 25 - 40 °C 4: 70 percent / NaOH / dimethylsulfoxide / 2 h / Heating 5: 1.) POCl3 / 1.) 40-45 deg C, 45 min, 2.) r.t., 16 h, then 70 deg C, 6 h 6: 1.) 30percent H2O2, 85percent HCOOH, 2.) NaOH / 1.) -5 deg C, 3-4 h then -10 deg C, 16 h, 2.) 50 deg C, 30 min View Scheme

1: O3 / acetic acid; H2O / 16 h / 15 °C 2: 61 percent / acetic acid; H2O / 60 h / 95 °C 3: 78 percent / NaOH, 30percent H2O2 / H2O / 2 h / 25 - 40 °C View Scheme