potassium hydroxide 1 h;

1.1: 60 percent / aq. KMnO4 / 2-methyl-propan-2-ol / 1.5 h / 75 °C 2.1: 90 percent / 3 h / 155 °C 3.1: TMSN3 / 3 h / 90 - 95 °C 3.2: 55 percent / dimethylformamide / 3 h / 155 °C 4.1: 100 percent / P2S5; pyridine / 36 h / 140 °C 5.1: 64 percent / KOH / 1 h View Scheme

1: 100 percent / P2S5; pyridine / 36 h / 140 °C 2: 64 percent / KOH / 1 h View Scheme

1.1: 90 percent / 3 h / 155 °C 2.1: TMSN3 / 3 h / 90 - 95 °C 2.2: 55 percent / dimethylformamide / 3 h / 155 °C 3.1: 100 percent / P2S5; pyridine / 36 h / 140 °C 4.1: 64 percent / KOH / 1 h View Scheme