1.1: sodium bis(trimethylsilyl)amide / tetrahydrofuran / 1 h / -78 °C 1.2: 82 percent / tetrahydrofuran / -78 °C 2.1: 95 percent / H2O2; LiOH / H2O; tetrahydrofuran / 0.5 h / 0 °C View Scheme