1: 51 percent / HCl / CHCl3; diethyl ether / 0.08 h / 0 °C 2: 59 percent / dimethylformamide / 1 h / 40 - 45 °C 3: 95 percent / aq. HCl / 20 h / 80 °C 4: 2) NaOAc / 1) water, 85 deg C, 1 h, 2) 0 deg C, 12 h 5: 85 percent / Fe2(SO4)3 / H2O / 1 h / 95 °C View Scheme