in further solvent(s) solvent: anhydrous HF;BF3 and solvent condensed on KAgF4 at -196 ° C, gas admitted slowly to promote crystallinity of product, mixture warmed, at ca. -40 ° C: pptn.; KBF4 removed by washing via decantation of the soln., product contaminated with KBF4;

in further solvent(s) solvent: anhydrous HF; soln. of KAgF4 exposed to excess Xe gas (2atm of pressure at ca. 20 ° C), all color in the supernatant soln. dissappeared within 10 min;; soln. removed under vac. at -30 ° C, AgF2 in the bottom of the tube, colorless ppt. of XeF2 on the walls of the tube;

water