hydrogenchloride 1 h; Heating;

1: 520 mg / 5 percent H2SO4 / 2 h / Heating 2: 280 mg / LiAlH4 / tetrahydrofuran / 5 h / Ambient temperature View Scheme

1: oxalyl chloride / toluene / 4 h / 55 °C 2: 340 mg / diethyl ether / 3 h / 0 °C 3: 15 percent / boron trifluoride diethyl etherate / 0.17 h / 20 °C View Scheme

1: oxalyl chloride / toluene / 4 h / 55 °C 2: 340 mg / diethyl ether / 3 h / 0 °C 3: 15 percent / boron trifluoride diethyl etherate / 0.17 h / 20 °C 4: 87 percent / NaBH4 / methanol / 2 h / 20 °C View Scheme