bromine T=100 - 110°C; 5 h;

1: 52 percent / dimethylformamide / 2 h / Ambient temperature 2: 94 percent / 50percent (CH3)2NH/MeOH / 24 h / Ambient temperature 3: 20 percent / 0.17 h / 250 - 260 °C 4: 27 percent / Br2 / 5 h / 100 - 110 °C View Scheme

1: 89 percent / (CH3)2NH-MeOH / 12 h / Ambient temperature 2: 52 percent / dimethylformamide / 2 h / Ambient temperature 3: 94 percent / 50percent (CH3)2NH/MeOH / 24 h / Ambient temperature 4: 20 percent / 0.17 h / 250 - 260 °C 5: 27 percent / Br2 / 5 h / 100 - 110 °C View Scheme

1: 20 percent / 0.17 h / 250 - 260 °C 2: 27 percent / Br2 / 5 h / 100 - 110 °C View Scheme

1: 94 percent / 50percent (CH3)2NH/MeOH / 24 h / Ambient temperature 2: 20 percent / 0.17 h / 250 - 260 °C 3: 27 percent / Br2 / 5 h / 100 - 110 °C View Scheme