in hydrogen fluoride dry HF condensed at -196°C onto mixt. of ClF6AsF6 and CsBF4, warmed for 30 min to 25°C with stirring; cooled to -78°C, filtered under N2 (2 atm), volatile at 25°C pumped off for 1.5 h, sepd. by fractional condensation through series of traps kept at -112, -142, and -196°C; IR, Raman anal.;

in hydrogen fluoride dry HF condensed at -196°C onto mixt. of ClF6AsF6 and CsBF4, warmed for 30 min to 25°C with stirring; cooled to -78°C, filtered under N2 (2 atm), volatile at 25°C pumped off for 1.5 h, sepd. by fractional condensation through series of traps kept at -112, -142, and -196°C; IR, Raman anal.;