trichlorophosphate T=90 - 100°C; 3 h;

1: 80 percent / potassium carbonate, potassium hydroxide, tetrabutylammonium hydrogensulfate / toluene / 20 h / Heating 2: 55 percent / phosporus oxychloride / 3 h / 90 - 100 °C View Scheme

trifluoroacetic acid 2 h; Heating / reflux;