1: With sodium hydrogencarbonate in methanol T=0 - 60°C; 2 h; 2: With sodium hydroxide in methanol; water T=80°C; 2 h; 3: With hydrogenchloride in methanol; water pH=3;

1.1: ethanol; sodium / 4 h / 10 °C 2.1: sodium hydrogencarbonate / methanol / 2 h / 0 - 60 °C 2.2: 2 h / 80 °C 2.3: pH 3 View Scheme