The addition compounds of BrFs with KF or SbFs are found to be excellent high temperature fluorinating agents. Dissociation pressures of KBrFi and BrF2SbF« to 350°have been measured and are of such a magnitude that these reagents can be used even at 500°in closed reaction vessels without developing high pressures. Many inorganic compounds, including refractory oxides, feldspars and oxygen-containing salts which resist fluorination by BrFg itself are readily converted to fluorides and elemental oxygen by KBrFi and BrF2SbFg at elevated temperatures. Apparatus and techniques for carrying out these unusual high temperature fluorination reactions are described and the relative merits of these two reagents compared. on the basis of their acid-base relationship.
opening of the tapered tip, thereupon the stopcock of the reservoir is closed. The lower trap then cuts off suction of gas through the right-hand tube. If the system were perfectly gas-tight at con-
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