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Radical cations of glyoxal, methylglyoxal, and dimethylglyoxal have been prepared, their e.s.r. spectra showing large α-proton couplings of ca. 83 G, (1 G = 10–4 T), which are somewhat greater than expected by comparison with the α-couplings of ca. 136 G in mono-aldehyde cations, assuming symmetrical delocalisation over both carbonyl groups in the glyoxal cations.
L. Portwood, C. J. Rhodes and M. C. R. Symons, J. Chem. Soc., Chem. Commun., 1986, 1535 DOI: 10.1039/C39860001535
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