in water aq. NH3 soln. mixed with SO2F2 and CaCO3 (pptn. of F(1-)) in sealed tube; shaken (15 min per l SO2F2);; filtration (from Ca compounds); evapn. (40°C/vac.); vac. (removal of remaining NH3 over concd. H2SO4); recrystn.;;
参考文献
Traube, W.; Reubke, E.
Ber., 1923 , vol. 56, p. 1656 - 1663