in dimethyl sulfoxide T=100 - 140°C; 6 h;

water Photolysis;

1: 29 percent / 10percent KOH / H2O; dimethylsulfoxide / 2 h / 18 - 20 °C 2: 61 percent / K2CO3 / dimethylformamide / 2.5 h / 80 - 100 °C 3: 28 percent / sodium hydrosulfite / methanol; H2O / 1 h / Ambient temperature 4: 97 percent / K2CO3 / dimethylformamide / 1 h / 80 - 100 °C 5: 2.) PPE / 1.) 130-135 deg C, 2h; 2.) 140-145 deg C, 1.5h 6: 75 percent / conc. HCl / acetic acid / 4 h / 100 - 110 °C 7: 41 percent / dimethylsulfoxide / 6 h / 100 - 140 °C View Scheme

1: 61 percent / K2CO3 / dimethylformamide / 2.5 h / 80 - 100 °C 2: 28 percent / sodium hydrosulfite / methanol; H2O / 1 h / Ambient temperature 3: 97 percent / K2CO3 / dimethylformamide / 1 h / 80 - 100 °C 4: 2.) PPE / 1.) 130-135 deg C, 2h; 2.) 140-145 deg C, 1.5h 5: 75 percent / conc. HCl / acetic acid / 4 h / 100 - 110 °C 6: 41 percent / dimethylsulfoxide / 6 h / 100 - 140 °C View Scheme

1: 2.) PPE / 1.) 130-135 deg C, 2h; 2.) 140-145 deg C, 1.5h 2: 75 percent / conc. HCl / acetic acid / 4 h / 100 - 110 °C 3: 41 percent / dimethylsulfoxide / 6 h / 100 - 140 °C View Scheme

1: 97 percent / K2CO3 / dimethylformamide / 1 h / 80 - 100 °C 2: 2.) PPE / 1.) 130-135 deg C, 2h; 2.) 140-145 deg C, 1.5h 3: 75 percent / conc. HCl / acetic acid / 4 h / 100 - 110 °C 4: 41 percent / dimethylsulfoxide / 6 h / 100 - 140 °C View Scheme

1: 28 percent / sodium hydrosulfite / methanol; H2O / 1 h / Ambient temperature 2: 97 percent / K2CO3 / dimethylformamide / 1 h / 80 - 100 °C 3: 2.) PPE / 1.) 130-135 deg C, 2h; 2.) 140-145 deg C, 1.5h 4: 75 percent / conc. HCl / acetic acid / 4 h / 100 - 110 °C 5: 41 percent / dimethylsulfoxide / 6 h / 100 - 140 °C View Scheme

1: 75 percent / conc. HCl / acetic acid / 4 h / 100 - 110 °C 2: 41 percent / dimethylsulfoxide / 6 h / 100 - 140 °C View Scheme