in methanol T=20°C; 1.5 h;

phosphoric acid; orthoarsenic acid

1: trichlorophosphate / 0.25 h / 90 °C 2: SnCl2·2H2O; hydrogenchloride / water / 6 h / 20 °C 3: palladium 10 on activated carbon; hydrogen / methanol / 16 h / 20 °C 4: methanol / 1.5 h / 20 °C View Scheme