0.20 g (0.5 mmol) of 2-chloro-3-octyl-6-(4-octyloxyphenyl)pyridine is heated together with 0.5 g of potassium fluoride, 0.5 g sodium fluoride and 0.02 g of 18-crown-6 in a sealed tube at 200° C. for 18 hours. The reaction mixture is taken up in ether/water, the organic phase is washed with water, dried over sodium sulfate, filtered, the solvent is distilled off, the residue is purified by chromatography (silica gel, 8:2 hexane/ethyl acetate) and recrystallized from acetonitrile, giving 0.11 g of 2-fluoro-3-octyl-6- (4-octyloxyphenyl ) pyridine. ##STR16##
