The reaction of CS 2 and tetramethylammonium fluoride (TMAF) with 2-H-heptafluoropropane (R227) leads to 2,4-bis(hexafluoroisopropylidene)-1,3-dithietane as well as to the tetramethylammonium salt of heptafluorodithioisobutyric acid. The latter anion resulted also from the reaction of CS 2 and CsF with hexafluoropropene (HFP), whereas CS 2 , TMAF and HFP reacted to compounds derived from HFP dimerization. N,N-bis(2,2,2-trifluoroethyl) dithiocarbamic acid anion was obtained from bis(trifluoroethyl)amine reacted with CS 2 and TMAF.