1: 98.6 percent / HCl(aq.) / methanol / Heating; time: 12 h 2: 81 percent / K2CO3 / acetone; dioxane / Heating; Time : 12 h 3: 85 percent / Jones reagent / acetone / 6 h / Ambient temperature 4: CH3ONa / methanol / 6 h / 140 - 150 °C View Scheme

1: 98.6 percent / HCl(aq.) / methanol / Heating; time: 12 h 2: 81 percent / K2CO3 / acetone; dioxane / Heating; Time : 12 h 3: 85 percent / Jones reagent / acetone / 6 h / Ambient temperature 4: sodium ethoxide / hexamethylphosphoric acid triamide / 4 h / 100 °C View Scheme