1: 81 percent / LiAlH4 / tetrahydrofuran / 24 h / Heating 2: 78 percent / pyridine, Cr2O3, kieselguhr / CH2Cl2 / 0.33 h / Ambient temperature 3: 71 percent / silica gel, 15percent H2SO4 / CH2Cl2 / 24 h / Ambient temperature View Scheme

1: 93 percent / Zn, chlorotrimethylsilane / CH2Cl2 / 0.5 h / 0 °C 2: 77 percent / pyridine, Cr2O3, kieselguhr / CH2Cl2 / 0.33 h / Ambient temperature 3: 79 percent / silica gel, 15percent H2SO4 / CH2Cl2 / 24 h / Ambient temperature View Scheme

1: 93 percent / Zn, chlorotrimethylsilane / CH2Cl2 / 0.5 h / 0 °C 2: 77 percent / pyridine, Cr2O3, kieselguhr / CH2Cl2 / 0.33 h / Ambient temperature View Scheme

lithium aluminium tetrahydride in tetrahydrofuran 24 h; Heating;

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