The synthesis of cyclic nitroalkans by reaction of tetrafluoroborate of nitronium with cycloolefins in the solution of sulphuric anhydride of -30÷ – 40oC has been corried out.The structure of synthesized compounds proved by IR- and NMR 1H spectroscopic metods.It revealed that synthesized compounds have antimicrobial properties in concentration 0.1-0.0001%.