T=120°C; 4 h;

1: 78 percent / 3 h / Heating 2: 77 percent / 10percent aq. NaOH, Zn / ethanol / Heating 3: 69 percent / 5 h / 150 °C 4: 82 percent / POCl3 / 0.5 h / Heating 5: 81 percent / 4 h / 120 °C View Scheme

1: 77 percent / 10percent aq. NaOH, Zn / ethanol / Heating 2: 69 percent / 5 h / 150 °C 3: 82 percent / POCl3 / 0.5 h / Heating 4: 81 percent / 4 h / 120 °C View Scheme

1: 69 percent / 5 h / 150 °C 2: 82 percent / POCl3 / 0.5 h / Heating 3: 81 percent / 4 h / 120 °C View Scheme

1: 82 percent / POCl3 / 0.5 h / Heating 2: 81 percent / 4 h / 120 °C View Scheme