1: in tetrahydrofuran T=-40°C; 2 h; 2: With water; ammonium chloride in tetrahydrofuran T=-40 - 20°C;

1.1: N,N-dimethyl-formamide; oxalyl dichloride / tetrahydrofuran / 3 h / 10 - 35 °C 1.2: 15 h / 10 - 35 °C / Cooling with ice 2.1: hydrogen; acetic acid / 5 rhodium-on-charcoal / water; methanol / 4 h / 3800.26 Torr / Cooling with ice 2.2: 15 h / 10 - 35 °C 3.1: tetrahydrofuran / 3 h / 10 - 35 °C / Cooling with ice 4.1: ethanol; sodium tetrahydroborate / 0.5 h / 10 - 35 °C View Scheme

1.1: hydrogen; acetic acid / 5 rhodium-on-charcoal / water; methanol / 4 h / 3800.26 Torr / Cooling with ice 1.2: 15 h / 10 - 35 °C 2.1: tetrahydrofuran / 3 h / 10 - 35 °C / Cooling with ice 3.1: ethanol; sodium tetrahydroborate / 0.5 h / 10 - 35 °C View Scheme

1: tetrahydrofuran / 3 h / 10 - 35 °C / Cooling with ice 2: ethanol; sodium tetrahydroborate / 0.5 h / 10 - 35 °C View Scheme