400°C;

in water formation of homogenous liquid on cautious heating of aq. soln. of XeO3 in polytrichloro ethylene vessel (vacuum, dehydration), condensation of XeOF4 on educt during cooling at -78°C, 12h;; fractionating distn. of liquid (which contains XeO2F2, XeOF4 and XeF2), purification of XeO2F2 on mass spectroscopy;;

400°C;