6,7-Dihydro-6-hydroxydipyrido[1,2-a:2′,1′-c]pyrazinium dibromide and dipyrido[1,2-a:2′,1′-c]pyrazinium dibromide are reduced in aqueous solution by a one-electron transfer to give stable radical cations. In the case of the latter salt the one-electron transfer is largely reversed by atmospheric oxidation.
A. L. Black and L. A. Summers, J. Chem. Soc. C, 1969, 610 DOI: 10.1039/J39690000610
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