FIELD: chemical industry. SUBSTANCE: invention describes method of preparing nitronium tetrafluoroborate used for nitration of aromatic compounds, amines, alcohols and olefins and also as oxidizing agent. Nitronium tetrafluoroborate is prepared by ionic exchange in medium that has no main properties of aproric solvent between tetraalkyl ammonium tetrafluoroborate and nitric anhydride. The method makes it possible to obtain the desired product without using highly volatile toxic corrosion active and rather inaccessible components. EFFECT: more efficient preparation method. 3 cl, 6 ex
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