1: With water; sodium hydroxide in methanol T=65°C; 4 h; 2: With hydrogenchloride in methanol; water T=20°C; pH=4 - 5;

1.1: N,N-dimethyl-formamide / 12 h / 120 °C 1.2: pH 3 - 4 2.1: lithium aluminium tetrahydride / diethyl ether / 3 h / 0 - 20 °C 3.1: phosphorus pentachloride / tetrachloromethane / 1 h / 20 °C 4.1: potassium iodide / water; dimethyl sulfoxide / 6 h / 45 °C 5.1: sodium hydroxide; water / methanol / 4 h / 65 °C 5.2: 20 °C / pH 4 - 5 View Scheme

1.1: lithium aluminium tetrahydride / diethyl ether / 3 h / 0 - 20 °C 2.1: phosphorus pentachloride / tetrachloromethane / 1 h / 20 °C 3.1: potassium iodide / water; dimethyl sulfoxide / 6 h / 45 °C 4.1: sodium hydroxide; water / methanol / 4 h / 65 °C 4.2: 20 °C / pH 4 - 5 View Scheme

1.1: potassium iodide / water; dimethyl sulfoxide / 6 h / 45 °C 2.1: sodium hydroxide; water / methanol / 4 h / 65 °C 2.2: 20 °C / pH 4 - 5 View Scheme

1.1: phosphorus pentachloride / tetrachloromethane / 1 h / 20 °C 2.1: potassium iodide / water; dimethyl sulfoxide / 6 h / 45 °C 3.1: sodium hydroxide; water / methanol / 4 h / 65 °C 3.2: 20 °C / pH 4 - 5 View Scheme