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 1 h; Heating;

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: 22 percent / POCl3 / 0.5 h / Heating View Scheme

trichlorophosphate 1 h; Heating;