Nitric Oxide - Reactions

Reactions

  • When exposed to oxygen, NO is converted into nitrogen dioxide.
2 NO + O2 → 2 NO2
This conversion has been speculated as occurring via the ONOONO intermediate. In water, NO reacts with oxygen and water to form HNO2 or nitrous acid. The reaction is thought to proceed via the following stoichiometry:
4 NO + O2 + 2 H2O → 4 HNO2
  • NO will react with fluorine, chlorine, and bromine to form the XNO species, known as the nitrosyl halides, such as nitrosyl chloride. Nitrosyl iodide can form but is an extremely short-lived species and tends to reform I2.
2 NO + Cl2 → 2 NOCl
  • Nitroxyl (HNO) is the reduced form of nitric oxide.
  • Nitric oxide reacts with acetone and an alkoxide to a diazeniumdiolate or nitrosohydroxylamine and methyl acetate:
This is a very old reaction (1898) but of interest today in NO prodrug research. Nitric oxide can also react directly with sodium methoxide, forming sodium formate and nitrous oxide.

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