1: 69.2 percent / AlCl3 / 1,2-dichloro-ethane / 3.75 h / 5 - 20 °C 2: 20 percent / NH2OH*HCl, pyridine / 4 h / Heating 3: 58 percent / 1 h / 90 °C 4: NaH / dimethylformamide / 4 h / Ambient temperature 5: 92 percent / aq. KOH / methanol / 1 h View Scheme