1.1: sulfuric acid / 1,4-dioxane; water / 5 h / 95 - 100 °C 2.1: acetic acid / methanol / 1 h / 20 °C 2.2: 25 - 45 °C 3.1: sodium hydroxide; water / methanol / 6 h / 20 °C View Scheme

1.1: sulfuric acid / 1,4-dioxane; water / 5 h / 95 - 100 °C 2.1: acetic acid / methanol / 1 h / 20 °C 2.2: 25 - 45 °C 3.1: sodium hydroxide; water / methanol / 6 h / 20 °C 4.1: sodium hydroxide; dihydrogen peroxide / dimethyl sulfoxide / 6 h / 20 °C View Scheme