phosphorus pentachloride

1: 1.) 35percent HCl, NaNO2; 2.) cupric chloride, SO2 / 1.) water, 0 deg C, 1 h; 2.) water, acetic acid 2: 81 percent / NH3 (gas) / CH2Cl2 / 2 h / 0 °C 3: 90 percent / 2M NaOMe / methanol / 24 h / Heating 4: 53 percent / PCl5 View Scheme