Abstract
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.

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