1: MeONa / methanol / 20 h / 20 °C 2: 37.14 g / aq. HClO4; AcOH; aq. H2O2 / 4 h / 50 °C 3: HCl / 4.5 h / Heating 4: 21.59 g / aq. TiCl3 / methanol / 20 h / 20 °C 5: 35.2 g / pyridinium bromide perbromide / 2-methyl-propan-2-ol / 4 h / 20 °C 6: 16.26 percent / H2O / methanol / 24 h / Heating View Scheme