METHOD OF PRODUCING SUBSTITUTED AROMATIC COMPOUNDS Russian patent published in 2016 - IPC C07C17/00 C07C25/00 

FIELD: chemistry.

SUBSTANCE: invention relates to improved method for producing fluorine-substituted aromatic compounds of formula ArF, where Ar is aromatic hydrocarbon or its derivatives containing electron-donor or electron-acceptor groups in aromatic ring, for example, alkyl, alkoxy, carbonyl, carboxyl, nitro group. Method for producing fluorine-substituted aromatic compounds by conversion of primary aromatic amines into tetrafluoroborates of arenodiazonium, and subsequent thermal decomposition of latter; method is characterised by that a mixture of primary aromatic amine, sodium nitrite, sodium or potassium tetrafluoroborate, p-toluene sulpho-acid, and inert organic solvent is heated at temperature facilitating diazotization reaction and formation of arenodiazonium tetrafluoroborate (25-95 °C), then heated at temperature sufficient for decomposition of formed arendiazonium tetrafluoroborate (110-150 °C). Process is carried out in following molar ratio of reactants, primary aromatic amine : sodium nitrite : sodium or potassium tetrafluoroborate:p-toluene sulpho-acid equal to 1:1-4:1-4:4-12 in presence of triethylbenzylammonium bromide.

EFFECT: solvent used is n-toluene sulpho-acid, taken in excess.

4 cl, 12 ex