User:Jorge Stolfi/Oxocarbon test
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An oxocarbon is a chemical compound consisting only of carbon and oxygen.♦
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The simplest and most common oxocarbons are carbon monoxide (CO) and carbon dioxide (CO2). There are however many other stable or metastable oxides of carbon which rarely occur outside chemical plants and laboratories, such as carbon suboxide (O=C=C=C=O), and mellitic anhydride (C12O9).♦
Several new oxides, with various degrees of stability, have been synthesized since the 1990s. These include many oxides which are inherently unstable and can be observed only momentarily as intermediates in chemical reactions. Three important examples are the dicarbon monoxide radical (:C=C=O), carbon trioxide (CO3),♦ and 1,2-dioxetanedione (C2O4).♦♦ There are also many oxocarbons which are very reactive, and can be studied only in the gas phase, or under matrix isolation conditions.♦