Carbon tetroxide

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What Wikipedia says

Carbon tetroxide or Oxygen carbonate (in its C2v isomer) is a highly unstable oxide of carbon with formula CO4. It was proposed as an intermediate in the O-atom exchange between carbon dioxide (CO2) and oxygen (O2) at high temperatures.

Excerpt from the Wikipedia article “Carbon tetroxide”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Chemfm 1 3 dioxetanedione.svg: Jorge Stolfi / derivative work: tpa2067 (Allô...), Public domain, via Wikimedia Commons.