potassium hydroxide in toluene 7.5 h; Heating;

1: 24 g / sodium hydride / dimethylformamide / 67 h / 120 °C 2: 3.1 g / potassium tert-butoxide / toluene / 23 h / Heating 3: hydrochloride (M) / dioxane / 2 h / Heating 4: 100 percent / HCl / diethyl ether / Ambient temperature 5: silver carbonate / benzene / Heating View Scheme