Pentacarbon dioxide
Encyclopedia
Pentacarbon dioxide, officially penta-1,2,3,4-tetraene-1,5-dione, is an oxide
of carbon
(an oxocarbon
) with formula C5O2 or O=C=C=C=C=C=O.
The compound is the third member of the series CnO2 with odd n, the first two members being carbon dioxide
(CO2) and carbon suboxide
(C3O2). The compound was described in 1988 by G. Maier and others, who obtained it by pyrolysis
of 1,3,5-cyclohexanetrione. It has also been obtained by flash vapor pyrolysis of 2,4,6-tris(diazo)cyclohexane-1,3,5-trione (C6N6O3). It is stable at room temperature in solution. The pure compound is stable up to −96°C, when it polymerizes.
Oxide
An oxide is a chemical compound that contains at least one oxygen atom in its chemical formula. Metal oxides typically contain an anion of oxygen in the oxidation state of −2....
of carbon
Carbon
Carbon is the chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds...
(an oxocarbon
Oxocarbon
An oxocarbon or oxide of carbon is an inorganic compound consisting only of carbon and oxygen.The simplest and most common oxocarbons are carbon monoxide and carbon dioxide...
) with formula C5O2 or O=C=C=C=C=C=O.
The compound is the third member of the series CnO2 with odd n, the first two members being carbon dioxide
Carbon dioxide
Carbon dioxide is a naturally occurring chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom...
(CO2) and carbon suboxide
Carbon suboxide
Carbon suboxide, or tricarbon dioxide, is an oxide of carbon with chemical formula C3O2 or O=C=C=C=O. Its four cumulative double bonds make it a cumulene...
(C3O2). The compound was described in 1988 by G. Maier and others, who obtained it by pyrolysis
Pyrolysis
Pyrolysis is a thermochemical decomposition of organic material at elevated temperatures without the participation of oxygen. It involves the simultaneous change of chemical composition and physical phase, and is irreversible...
of 1,3,5-cyclohexanetrione. It has also been obtained by flash vapor pyrolysis of 2,4,6-tris(diazo)cyclohexane-1,3,5-trione (C6N6O3). It is stable at room temperature in solution. The pure compound is stable up to −96°C, when it polymerizes.