1: 90 percent / phosphorus pentaoxide, phosphoric acid / chlorobenzene / 1 h / 125 - 130 °C 2: 48 percent / benzoyl peroxide, N-bromosuccinimide / CCl4 / 8 h / Heating; Irradiation 3: 70 percent / 1.) hexamethylenetetramine / 1.) CHCl3, reflux, 4 h; 2.) H2O, AcOH, reflux, 3 h View Scheme

1: 62 percent / sodium ethoxide / 20 h / Heating 2: 90 percent / phosphorus pentaoxide, phosphoric acid / chlorobenzene / 1 h / 125 - 130 °C 3: 48 percent / benzoyl peroxide, N-bromosuccinimide / CCl4 / 8 h / Heating; Irradiation 4: 70 percent / 1.) hexamethylenetetramine / 1.) CHCl3, reflux, 4 h; 2.) H2O, AcOH, reflux, 3 h View Scheme

1: n-butyllithium / N-methyl-acetamide; hexane; water; ethyl acetate; Petroleum ether 2: sodium hydroxide / 1,4-dioxane; ethyl acetate; Petroleum ether View Scheme

silver(l) oxide in water icebath;