1: 86 percent / LiAlH4 / tetrahydrofuran / 24 h / Heating 2: 90 percent / pyridine, Cr2O3, kieselguhr / CH2Cl2 / 0.33 h / Ambient temperature 3: 60 percent / silica gel, 15percent H2SO4 / CH2Cl2 / 24 h / Ambient temperature View Scheme

1: 90 percent / Zn, chlorotrimethylsilane / CH2Cl2 / 0.5 h / 0 °C 2: 80 percent / pyridine, Cr2O3, kieselguhr / CH2Cl2 / 0.33 h / Ambient temperature 3: 63 percent / silica gel, 15percent H2SO4 / CH2Cl2 / 24 h / Ambient temperature View Scheme

lithium aluminium tetrahydride in tetrahydrofuran 24 h; Heating;

chloro-trimethyl-silane; zinc in dichloromethane T=0°C; 0.5 h;

1: 87 percent / LiAlH4 / tetrahydrofuran / 8 h / Heating 2: 90 percent / pyridine, chromium trioxide, celite / CH2Cl2 / 0.67 h / 20 - 25 °C View Scheme

1: 86 percent / LiAlH4 / tetrahydrofuran / 24 h / Heating 2: 90 percent / pyridine, Cr2O3, kieselguhr / CH2Cl2 / 0.33 h / Ambient temperature View Scheme