H2O

NaOH byproducts: NaF, H2O, O2; 20 percent NaOH soln., gaseous and liq. BrF5;

heating;

hydrogen fluoride in further solvent(s) Cs2NiF6 was suspended in BrF5 at 25°C, frozen at -196°C, AsF5 was added, warmed to 25°C, stirred for 5 min, frozen at -196°C, HF was condensed, stirred at 25°C for 12 h; volatiles were removed in vac. for 12 h at 25°C, suspended in HF at -20°C, N2 was passed through reactor, evapd., washed with HF at -78°C;

in further solvent(s) react. in BrF5 at -55°C; identified by NMR;

immediately;