1: 77 percent / NaH / dimethylformamide / 48 h / 0 - 20 °C 2: 100 percent / aq. NaOH / ethanol / 2 h / Heating 3: 73 percent / CuOCrO3 / quinoline / 2.5 h / Heating 4: NH2NH2*H2O / Raney Ni / methanol / 3 h / Heating View Scheme

sodium hydroxide; tetrabutylammomium bromide in water; benzene T=48°C; Condensation; 18 h;

zinc(II) iodide in dichloromethane 11 h; Ambient temperature;