Carbonic Anhydride
Carbonic anhydride may refer to: * Carbon dioxide, the acidic oxide of carbonic acid * Dicarbonic acid, the monoanhydride of carbonic acid using two molecules * 1,3-Dioxetanedione, the dianhydride of carbonic acid using two molecules * 1,3,5-Trioxanetrione The chemical compound 1,3,5-trioxanetrione, or 1,3,5-trioxacyclohexane-2,4,6-trione is an unstable oxide of carbon with formula CO. It can be considered a cyclic trimer of carbon dioxide (CO) or as a triple ketone of 1,3,5-trioxane 1,3,5-Tri ...

Carbon Dioxide
Carbon dioxide ( chemical formula ) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature. In the air, carbon dioxide is transparent to visible light but absorbs infrared radiation, acting as a greenhouse gas. It is a trace gas in Earth's atmosphere at 421  parts per million (ppm), or about 0.04% by volume (as of May 2022), having risen from pre-industrial levels of 280 ppm. Burning fossil fuels is the primary cause of these increased CO2 concentrations and also the primary cause of climate change.IPCC (2022Summary for policy makersiClimate Change 2022: Mitigation of Climate Change. Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA Carbon dioxide is soluble in water and is found in groundwater, lakes, i ...
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1,3-Dioxetanedione
The chemical compound 1,3-dioxetanedione, or 1,3-dioxacyclobutane-2,4-dione 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 A microsecond is a unit of time in the International System of Units (SI) equal to one millionth (0.000001 or 10−6 or ) of a second. Its symbol is μs, sometimes simplified to us when Unicode is not available. A microsecond is equal to 1000 ...) but may be stable at −196 °C.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. References Oxocarbons Dioxetanes Hypothetical chemical compounds {{theoretical-chem-stub ...
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