phosphorus pentachloride in chlorobenzene 1.) 11 h, 80 deg C, 2.) 1.5 h, 130 deg C;

phosphorus pentachloride in toluene T=80°C; 4 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

phosphorus pentachloride 1.) 5 h, 60 deg C, 2.) 0.5 h, 75 deg C; Yield given. Yields of byproduct given. Title compound not separated from byproducts;