Home – Home – Jornals – Chemistry for Sustainable Development 2007 number 5

The complex of problems and directions is considered concerning an accelerated development of the methods for the synthesis of fluorine containing benzene derivatives through the action of potassium fluoride on chlorine containing arenes. The use of interphase transfer catalysts (such as hexaethylguanidinium chloride, quaternary ammonium and phosphonium salts, tetra(diethylamino)phosphonium and tetraphenylphosphonium bromides) is shown to be efficient for the obtaining of monofluoro benzene derivatives and polyfluoroaromatic compounds via the action of potassium fluoride on monochloroarenes and polychloroarenes. It is established that the catalytic participation of polyethers (such as dimethyl ether of tetraethyleneglycol, 18-crown-6) in the processes of fluorodechlorination is limited to an increase in the concentration of an "active" fluoride ion. Possibilities are considered for the application of mechanochemical technology for the synthesis of fluoroaromatic compounds via the substitution of chlorine by fluorine in solid phase of chloroaromatic compounds, alkali and alkaline-earth metal fluorides as well as composite mixtures based on them.