Azoxy

Azoxy compounds are a group of chemical compounds sharing a common functional group with the general structure RN=N+(O−)R.[1] They are considered N-oxides of azo compounds. Azoxy compounds are 1,3-dipoles. They undergo 1,3 dipolar cycloaddition with double bonds.

The structure of the azoxy functional group, where R is a substituent.
Azoxybenzene - An example azoxy compound.

Preparation

Most azoxy-containing compounds have aryl substituents. They are typically prepared by reduction of nitrocompounds, such as the reduction of nitrobenzene with arsenous oxide to azoxybenzene.[2] Such reactions are proposed to proceed via the intermediacy of the hydroxylamine and nitroso compounds, e.g. phenylhydroxylamine and nitrosobenzene:

PhNHOH + PhNO → PhN(O)NPh + H2O

Safety

Alkyl azoxy compounds, e.g. azoxymethane are suspected to be genotoxic.[3]

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References
  1. IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version:  (2006–) "azoxy compounds". doi:10.1351/goldbook.A00567
  2. H. E. Bigelow and Albert Palmer "Azoybenzene" Org. Synth. 1931, 11, 16. doi:10.15227/orgsyn.011.0016
  3. Guideline On The Limits Of Genotoxic Impurities "Archived copy" (PDF). Archived from the original (PDF) on 2006-09-04. Retrieved 2007-07-11.CS1 maint: archived copy as title (link)
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