trichlorophosphate T=170 - 175°C; 18 h;

1: 95 percent / tetrakis(triphenylphosphine)palladium, sodium formate / dimethylformamide / 2 h / 100 °C 2: 31 percent / POCl3 / 1 h / Heating 3: 74 percent / H2, sodium acetate / 20percent Pd carbon / ethanol 4: 79 percent / 90percent H2O2, maleic anhydride / CHCl3 / 1.) overnight; 2.) reflux, 4 h 5: 64 percent / POCl3 / 0.5 h / Heating View Scheme

1: 31 percent / POCl3 / 1 h / Heating 2: 74 percent / H2, sodium acetate / 20percent Pd carbon / ethanol 3: 79 percent / 90percent H2O2, maleic anhydride / CHCl3 / 1.) overnight; 2.) reflux, 4 h 4: 64 percent / POCl3 / 0.5 h / Heating View Scheme

trichlorophosphate 0.5 h; Heating;

1: 79 percent / 90percent H2O2, maleic anhydride / CHCl3 / 1.) overnight; 2.) reflux, 4 h 2: 64 percent / POCl3 / 0.5 h / Heating 3: 18 percent / 90percent H2O2, maleic anhydride / CHCl3 / 1.) room temperature, overnight; 2.) reflux, 3 h 4: 95 percent / tetrakis(triphenylphosphine)palladium, sodium formate / dimethylformamide / 2 h / 100 °C 5: 31 percent / POCl3 / 1 h / Heating View Scheme

1: 64 percent / POCl3 / 0.5 h / Heating 2: 18 percent / 90percent H2O2, maleic anhydride / CHCl3 / 1.) room temperature, overnight; 2.) reflux, 3 h 3: 95 percent / tetrakis(triphenylphosphine)palladium, sodium formate / dimethylformamide / 2 h / 100 °C 4: 31 percent / POCl3 / 1 h / Heating View Scheme

1: 92 percent / tetrakis(triphenylphosphine)palladium, sodium formate / dimethylformamide / 2 h / 100 °C 2: 31 percent / POCl3 / 1 h / Heating View Scheme

1: 48 percent / 90percent H2O2, maleic anhydride / CHCl3 / 1.) room temperature, overnight; 2.) reflux, 3 h 2: 92 percent / tetrakis(triphenylphosphine)palladium, sodium formate / dimethylformamide / 2 h / 100 °C 3: 31 percent / POCl3 / 1 h / Heating View Scheme

trichlorophosphate 1 h; Heating;

1: 1.) NaOH, 2.) HCl / 1.) H2O, MeOH, -30 deg C to r.t., 2.) r.t. 2: 92 percent / POCl3 / 18 h / 170 - 175 °C View Scheme