Pentacarbon dioxide

Pentacarbon dioxide
Names


IUPAC name penta-1,2,3,4-tetraene-1,5-dione
Identifiers
CAS Number	51799-36-1^N
3D model (Jmol)	Interactive image
ChemSpider	454765^Y
PubChem CID	521350
InChI InChI=1S/C5O2/c6-4-2-1-3-5-7^Y Key: BKMBQDLZBSCFGV-UHFFFAOYSA-N^Y InChI=1/C5O2/c6-4-2-1-3-5-7 Key: BKMBQDLZBSCFGV-UHFFFAOYAJ
SMILES O=C=C=C=C=C=O
Properties
Chemical formula	C₅O₂
Molar mass	92.05 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N (what is ^YN ?)
Infobox references

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 C_nO₂ 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 (phloroglucin, the tautomeric form of phloroglucinol). 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.

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