acetic anhydride; potassium carbonate in hydrogen fluoride dissolving H3AsO4 (2g) in 40percentHF (4.6g), of exothermic react.; then addn. portions of acetanhydride (21.5g), 50°C (cooling); warming, 30min, 50°C; addn. of K2CO3 (1.95g);; pptn.; washing with ether, drying in vac.; addn. of react. soln. to aq. K2CO3 (effervescence), removal of H2O, extraction with acetonitrile; recrystn. from CH3CN; detn. by 19F-NMR, X-ray;;

potassium bromide in liquid sulphur dioxide react. of KBr and AsF5 in SO2; vigorous react. on warming to room temp.; pptn. after 16 h; evapn.;

in liquid sulphur dioxide S8(AsF6)2 in SO2 was added onto KI, stirred for 2 h at room temp., filtered, SO2ClF was added; volatiles were removed;

in hydrogen fluoride HF (liquid); absence of air and moisture, poly(fluorinated hydrocarbon) apparatus; excess KF, 20°C (pptn. of AgF2); decantation; product mixt. from decantate not sepd., detd. by powder X-ray diffraction;

in water centrifugation, recrystn. (H2O);

in water centrifugation, recrystn. (H2O);