METHOD OF SYNTHESIS OF HEXAFLUOROBENZENE OR ITS MONO- OR DISUBSTITUTED DERIVATIVES Russian patent published in 1997 - IPC

FIELD: chemical technology. SUBSTANCE: invention relates to chemical technology of polyfluoroarenes, in part, synthesis of hexafluorobenzene or its mono- or disubstituted derivatives of the formula C₆F₄-XY where: X - F, Cl, H, CF₃, CCl₃; Y - F, CN, H, Cl, CF₃, CCl₃. These derivatives were synthesized by chlorine substitution in the corresponding polychloroarenes with potassium fluorofluoride without solvent at heating to 150-250 C in the presence of catalytic system quaternary phosphonium salt/water at mole ratio of components = (1:0.5)-(1:50) and mole ratio potassium fluoride and quaternary phosphonium salt = (200:1)-(10:1). The yield of the end product is up to 98.7%. Synthesized compounds were used for synthesis of dyes, drugs, monomers. EFFECT: improved method of synthesis, increased yield. 5 cl