trichlorophosphate T=120°C; 1 h; Heating / reflux;

1.1: toluene-4-sulfonic acid / toluene / 15 h / Reflux 2.1: hydrogen / palladium 10 on activated carbon / 12 h / 25 °C / 760.05 Torr 3.1: triethylamine / tetrahydrofuran / 0.17 h / 0 °C 3.2: 0.42 h / 0 - 20 °C 3.3: 1 h / 20 °C / pH 2 4.1: trichlorophosphate / 1 h / 120 °C View Scheme

1.1: hydrogen / palladium 10 on activated carbon / 12 h / 25 °C / 760.05 Torr 2.1: triethylamine / tetrahydrofuran / 0.17 h / 0 °C 2.2: 0.42 h / 0 - 20 °C 2.3: 1 h / 20 °C / pH 2 3.1: trichlorophosphate / 1 h / 120 °C View Scheme

2: oxalyl dichloride View Scheme

palladium on activated charcoal