title: Nitronium tetrafluoroborate
text: # Nitronium tetrafluoroborate
  
  Nitronium tetrafluoroborate is an inorganic compound with formula $NO_2BF_4.$ It is a salt of nitronium cation and tetrafluoroborate anion. It is a colorless crystalline solid, which reacts with water to form the corrosive acids HF and $HNO_3.$ As such, it must be handled under water-free conditions. It is sparsely soluble in many organic solvents.
  
  ## Preparation
  
  Nitronium tetrafluoroborate can be prepared by adding a mixture of anhydrous hydrogen fluoride and boron trifluoride to a nitromethane solution of nitric acid or dinitrogen pentoxide.
  
  ## Applications
  
  Nitronium tetrafluoroborate is used as a nitration agent.
  
  