1.1: NaH / tetrahydrofuran / 3 h / 20 °C 1.2: tetrahydrofuran / 3 h / 20 °C 1.3: 86 percent / tetrahydrofuran / 16 h / 20 °C 2.1: 83 percent / AIBN; tri-n-butyltin hydride / toluene / 3 h / Heating 3.1: 92 percent / LiAlH4 / tetrahydrofuran / 20 °C 4.1: 86 percent / pyridinium chlorochromate / CH2Cl2 5.1: NaH / hexane; 1,2-dimethoxy-ethane / 0.5 h / 0 °C 5.2: 65 percent / hexane; 1,2-dimethoxy-ethane / 19 h / 0 - 20 °C 6.1: 52 percent / N2H4*H2O; NaOH / triethylene glycol / 7 h / Heating View Scheme