1: With 1,1'-carbonyldiimidazole in ethyl acetate 3 h; 2: With ammonia in ethyl acetate 1 h;

1.1: dibenzoyl peroxide; 1,3-dibromo-5,5-dimethyl-hydantoin / tetrachloromethane / 7 h / Reflux 2.1: calcium carbonate / 1,4-dioxane; water / 16 h / Reflux 3.1: potassium permanganate / water; acetone / 1 h / Reflux 4.1: 1,1'-carbonyldiimidazole / ethyl acetate / 3 h / Reflux 4.2: 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 View Scheme

1.1: potassium permanganate / water; acetone / 1 h / Reflux 2.1: 1,1'-carbonyldiimidazole / ethyl acetate / 3 h / Reflux 2.2: 1 h / 20 °C View Scheme

phosphorus pentoxide in chloroform 48 h; Reflux;

1: phosphorous pentoxide / chloroform / 48 h / Reflux 2: dibenzoyl peroxide; N-bromosuccinmide / tetrachloromethane / 10 h / Reflux View Scheme