1: 75 percent / Fremy's salt, KH2PO4 / methanol / 0.5 h / Ambient temperature 2: 1.) Ac2O, H2SO4; 2.) NaOMe / 1.) MeOH, overnight; 2.) MeOH, 30 min 3: 85 percent / 48percent aq. HBr / 1 h / 60 - 65 °C View Scheme