Phosphorus trichloride radioactive

Preparation of phosphorus trichloride. The following were placed in the flask F isopropyl alcohol (10 ml.), carbon tetrachloride (5 ml.) and glass wool. The taps between D and E and between G and H were opened, and G and D were cooled in liquid air. Radioactive phosphorus (1 g.) was placed in the vessel B, and non-radioaetive phosphorus trichloride (1 ml.) then added. B was then fixed in position and the bottom of the vessel heated so that the phosphorus tri-... 

The probable impurities in radioactive phosphorus trichloride are hydrogen chloride and phosphorous acid the trichloride is, therefore, purified by fractional evaporation and fractional condensation in the high-vacuum system. Pure ethylphosphonous dichloride is prepared according to the equation ... 

Pyrophosphoryl chloride, P2O3CI4, is a colourless oily liquid mp = -16.5°C, bp = 215°C (d). It can be made by passing chlorine into a suspension of phosphorus pentoxide in phosphorus trichloride and carbon tetrachloride, when PCI5 is formed, which then reacts as in (4.326). Studies with radioactive labelled P atoms indicate that the P-O-P linkages in the P4O10 molecule are utilised in the new molecule which has a structure analogous to that of (4.325). 

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