1: 85 percent / phosphorus oxychloride / 1,2-dichloro-ethane / 16 h / 20 °C 2: 66 percent / pyridine hydrochloride / 3 h / 180 - 190 °C 3: potassium hydroxide / ethanol / 15 h / 20 °C / pH 8 View Scheme

hydrogen bromide

trichlorophosphate in 1,2-dichloro-ethane T=20°C; 16 h;

1: 85 percent / phosphorus oxychloride / 1,2-dichloro-ethane / 16 h / 20 °C 2: 66 percent / pyridine hydrochloride / 3 h / 180 - 190 °C View Scheme