Английская Википедия:1,3-Dioxetanedione

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The chemical compound 1,3-dioxetanedione, or 1,3-dioxacyclobutane-2,4-dione, also known as dicarbonic anhydride, is a hypothetical oxide of carbon with formula C2O4. It can be considered a cyclic dimer of carbon dioxide (CO2) or as a double ketone of 1,3-dioxetane (1,3-dioxacyclobutane).

Theoretical calculations indicate that the compound would be extremely unstable at room temperature (half-life of less than 1.1 μs) but may be stable at −196 °C.[1]

References

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  1. Errol Lewars (1996), Polymers and oligomers of carbon dioxide: ab initio and semiempirical calculations. Journal of Molecular Structure: THEOCHEM, Volume 363, Number 1, pp. 1–15.