aluminium trichloride in dichloromethane 3 h; Ambient temperature;

ICl3; trimethyl orthoformate T=23°C; 24 h;

ICl3 T=23°C; 24 h;

1: 1) NaH / 1) DMF, 20 deg C to 30 deg C, 30 min, 2) DMF, room temperature, overnight 2: conc. aq. HCl / H2O; dioxane / 108 h / Heating 3: 94 percent / NaOH / H2O / 24 h / Heating 4: 90 percent / hydrazine hydrate / H2O / 2 h / Heating View Scheme