potassium fluoride; anhydrous tetramethylammonium chloride in dimethyl sulfoxide T=150°C; 2 h;

1.1: 75 percent / HCOONH4; aq. AcOH / Pd/C / 6 h / 25 °C 2.1: BuLi / tetrahydrofuran; hexane 2.2: 81 percent / 1,1,2-trichloro-1,2,2-trifluoroethane / tetrahydrofuran; hexane 3.1: 75 percent / KF; tetramethylammonium chloride / dimethylsulfoxide / 2 h / 150 °C View Scheme

caesium tetrafluorocobaltate(III) in gaseous matrix T=310°C; 3.5 h; Further byproducts given;

1.1: BuLi / tetrahydrofuran; hexane 1.2: 81 percent / 1,1,2-trichloro-1,2,2-trifluoroethane / tetrahydrofuran; hexane 2.1: 75 percent / KF; tetramethylammonium chloride / dimethylsulfoxide / 2 h / 150 °C View Scheme