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| Names | |
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| IUPAC name penta-1,2,3,4-tetraene-1,5-dione | |
| Identifiers | |
3D model (JSmol) | |
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| Properties | |
| C5O2 | |
| Molar mass | 92.05 g/mol |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Pentacarbon dioxide, officiallypenta-1,2,3,4-tetraene-1,5-dione, is anoxide ofcarbon (anoxocarbon) with formula C5O2 or O=C=C=C=C=C=O.
The compound was described in 1988 by Günter Maier and others, who obtained it bypyrolysis of 2,4,6-tris(diazo)cyclohexane-1,3,5-trione (C6N6O3).[1][2]: 97 Diazo transfer can produce the latter compound fromphloroglucinol.[1] It is stable at room temperature in solution.[1] The pure compound is stable up to −90 °C, at which point it polymerizes.[2]: 100
