potassium fluoride in various solvent(s) T=130°C; P=150 Torr;

sodium hydroxide; tetreamethyl ammonium hydroxide in water T=80°C; 72 h;

sodium hydroxide; N-benzyl-N,N,N-triethylammonium chloride 3 h; Ambient temperature;

1: 80 percent / Br2, Hg(OAc)2 / Ambient temperature 2: 95 percent / NaOH / H2O / 1.) 0 deg C; 2.) r.t., 1 h; 3.) 40 deg C, 0.5 h 3: 70 percent / t-BuOK / tetrahydrofuran / 1.) -10 deg C; 2.) r.t. View Scheme