1: 90 percent / AlCl3 / CH2Cl2 / 18 h / Ambient temperature 2: 52 percent / LiAlH4 / tetrahydrofuran / 1.25 h / Ambient temperature 3: 70 percent / potassium nitrosodisulfonate (Fremy's salt), NaAc / H2O; methanol / 0.5 h / Ambient temperature View Scheme