water in neat (no solvent) mixt. of telluric acid and distd. HSO3F with a few mililiters of H2O was heated at 160-170°C for 5-6 h; according to Seppelt, K.; Nothe,D. Inorg. Chem. 1973, 12, 2727; purified by fractional condensation;

in neat (no solvent) byproducts: H2SO4; to freshly destilled HSO3F added H6TeO6, heated with stirring, destilled, condensed , H6TeO6 added to the residue; destilled, condensed, fractional destillation;

in neat (no solvent) byproducts: CsSO3F; CsTeF5O was evacuated and cooled to -196°C, FOSO2F (molar ratio 1.22:1) was added from vac. line, closed, warmed slowly to -78°C in liq. N2-CO2 slush bath, kept at -45°C for 9 d, cooled to -196°C; pumped off, sepd. by fractional condensation in traps (-78, -126 and -196°C);

in further solvent(s) byproducts: trans-butene; dissolving in 1-chlorobutane;

in water mixing at -78°C, addn. of water, refluxing under nitrogen; distn. (vac.);

in hydrogen fluoride 60°C, 2 h;

hydrolysis;

in neat (no solvent) byproducts: NF3, HF; TeF5OH was added to NF4NF2*99HF on vac. line at -196°C, warmed slowly to -23°C, kept for 8 h under dynamic vac.; volatiles sepd. by fractional condensation in traps (-95, -126, -142 and -210°C);