β-Carbon-protonated keten (the methyloxocarbenium or acetyl ion) is computed to be more stable than its α-carbon- or oxygen-protonated isomers. The proton affinities of C2O2–, HC2O–, and H2C2O are computed to be 651·7, 448·4, and 216·8 kcal mol–1 respectively.
A. C. Hopkinson, J. Chem. Soc., Perkin Trans. 2, 1973, 795 DOI: 10.1039/P29730000795
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