in neat (no solvent) heating for a longer period of time excluding air;;

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '2036449', constants.ctx, '0')">phosphorus pentachloride</a>;&nbsp;<a href="#" onclick="return RXDsubstances(event, this, '969177', constants.ctx, '0')">phosphorus trichoride</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '956581', constants.ctx, '0')">trichlorophosphate</a> <br />&nbsp;addn. of PCl3 to CrO2Cl2 in POCl3; addn. of boiling PCl5 soln.; pptn.;;&nbsp;<br /> &nbsp;

<b>With</b>&nbsp; PCl₅&nbsp;<b>in</b>&nbsp; melt<br />&nbsp;react. of molten PCl5 with CrCl3;;&nbsp;<br /> &nbsp;