1: calcium carbonate / 1,4-dioxane; water / 16 h / Reflux 2: potassium permanganate / water; acetone / 1 h / Reflux View Scheme

1.1: calcium carbonate / 1,4-dioxane; water / 16 h / Reflux 2.1: potassium permanganate / water; acetone / 1 h / Reflux 3.1: 1,1'-carbonyldiimidazole / ethyl acetate / 3 h / Reflux 3.2: 1 h / 20 °C View Scheme

1.1: calcium carbonate / 1,4-dioxane; water / 16 h / Reflux 2.1: potassium permanganate / water; acetone / 1 h / Reflux 3.1: 1,1'-carbonyldiimidazole / ethyl acetate / 3 h / Reflux 3.2: 1 h / 20 °C 4.1: phosphorous pentoxide / chloroform / 48 h / Reflux View Scheme

1.1: calcium carbonate / 1,4-dioxane; water / 16 h / Reflux 2.1: potassium permanganate / water; acetone / 1 h / Reflux 3.1: 1,1'-carbonyldiimidazole / ethyl acetate / 3 h / Reflux 3.2: 1 h / 20 °C 4.1: phosphorous pentoxide / chloroform / 48 h / Reflux 5.1: dibenzoyl peroxide; N-bromosuccinmide / tetrachloromethane / 10 h / Reflux View Scheme

calcium carbonate in 1,4-dioxane; water 16 h; Reflux;