Recently the synthesis of XeF4 was reported from the Argonne Nationlll
Laborato·ry, and some of its physical properties were given1• In order to
obtalin further information on this extraordinarily interesting compound
XeF4 was prepared in our laboratory. Siince the details of the synthesis
were not available the direct fluorination was performed under pressure at
400°C. The basic .idea was to obtain the maximum possible amount of the
product in a small v.ol\u27l.lllle. The p.roduct was identified by mass spectroscopic analysis2 • The X-ray pattern was taken and the magnetic susceptibility was also measured. At present the NMR spectra are al!so under investigatioiil
