sulfuric acid in acetic acid T=100°C; 2 h;

sulfuric acid in acetic acid T=100°C; 0.5 h;

1: 69 percent / K2CO3 / dimethylformamide / 5.5 h / 115 °C 2: 1.) NaH / 1.) DMF, 85 deg C, 17 h; 2.) 75 deg C, 24 h 3: 76 percent / Triton B / 5.5 h / Heating 4: 94 percent / conc. sulphuric acid / acetic acid / 2 h / 100 °C View Scheme

1: 78 percent / dimethylsulfoxide; H2O / 120 h / 165 °C / Heating 2: 76 percent / Triton B / 5.5 h / Heating 3: 94 percent / conc. sulphuric acid / acetic acid / 2 h / 100 °C View Scheme