in dimethyl sulfoxide T=100 - 140°C; 1 h;

1: 29 percent / 10percent KOH / H2O; dimethylsulfoxide / 2 h / 18 - 20 °C 2: 65 percent / K2CO3, KI / acetone / 4 h / Heating 3: 90 percent / H2, Raney Ni / ethanol 4: 1 h / 140 - 145 °C 5: PPE / 1 h / 140 - 145 °C 6: 94 percent / conc. HCl / acetic acid / 3 h / Heating 7: 38 percent / dimethylsulfoxide / 1 h / 100 - 140 °C View Scheme

1: 90 percent / H2, Raney Ni / ethanol 2: 1 h / 140 - 145 °C 3: PPE / 1 h / 140 - 145 °C 4: 94 percent / conc. HCl / acetic acid / 3 h / Heating 5: 38 percent / dimethylsulfoxide / 1 h / 100 - 140 °C View Scheme

1: 65 percent / K2CO3, KI / acetone / 4 h / Heating 2: 90 percent / H2, Raney Ni / ethanol 3: 1 h / 140 - 145 °C 4: PPE / 1 h / 140 - 145 °C 5: 94 percent / conc. HCl / acetic acid / 3 h / Heating 6: 38 percent / dimethylsulfoxide / 1 h / 100 - 140 °C View Scheme

1: 94 percent / conc. HCl / acetic acid / 3 h / Heating 2: 38 percent / dimethylsulfoxide / 1 h / 100 - 140 °C View Scheme

1: 1 h / 140 - 145 °C 2: PPE / 1 h / 140 - 145 °C 3: 94 percent / conc. HCl / acetic acid / 3 h / Heating 4: 38 percent / dimethylsulfoxide / 1 h / 100 - 140 °C View Scheme

1: PPE / 1 h / 140 - 145 °C 2: 94 percent / conc. HCl / acetic acid / 3 h / Heating 3: 38 percent / dimethylsulfoxide / 1 h / 100 - 140 °C View Scheme