1: 85 percent / 20 percent aq. NaOH, 30 percent aq. H2O2 / RT, 1 h, reflux, 2 h 2: sodium, liquid ammonia / tetrahydrofuran / 3 h / -78 °C 3: 1 M NaOH / dioxane; H2O / 3 h / Ambient temperature View Scheme

1: 85 percent / 20 percent aq. NaOH, 30 percent aq. H2O2 / RT, 1 h, reflux, 2 h 2: sodium, liquid ammonia / tetrahydrofuran / 3 h / -78 °C View Scheme