The dimer of 1-(5-nitro-2-pyridyl)-3-oxidopyridinium and its reactions

Authors:
  • NDNicholas Dennis
    Nicholas Dennis
  • BIBadreldin Ibrahim
    Badreldin Ibrahim
  • AKAlan R. Katritzky
    Alan R. Katritzky
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Abstract
The betaine 1-(5-nitro-2-pyridyl)-3-oxidopyridinium reversibly forms a dimer which provides a convenient source of the reactive betaine monomer; olefinic dipolarophiles add readily at the 2,6-positions, 2,3-dimethylbutadiene reacts across the 2,4-positions and stereochemical integrity is preserved during the addition of maleic and fumaric esters.