Carbon suboxide

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Carbon suboxide
Stick model of carbon suboxide
Spacefill model of carbon suboxide
Names
IUPAC name
Propa-1,2-diene-1,3-dione
Identifiers
504-64-3 YesY
ChEBI CHEBI:30086 YesY
ChemSpider 120106 YesY
Jmol 3D model Interactive image
MeSH Carbon+suboxide
PubChem 136332
  • InChI=1S/C3O2/c4-2-1-3-5 YesY
    Key: GNEVIACKFGQMHB-UHFFFAOYSA-N YesY
  • InChI=1S/C3O2/c4-2-1-3-5
    Key: GNEVIACKFGQMHB-UHFFFAOYSA-N
  • InChI=1/C3O2/c4-2-1-3-5
    Key: GNEVIACKFGQMHB-UHFFFAOYAU
  • O=C=C=C=O
Properties
C3O2
Molar mass 68.03 g·mol−1
Appearance colorless gas
Odor strong, pungent odor
Density 0.906 ± 0.06 g cm−3, gas at 298 K
Melting point −111.3 °C (−168.3 °F; 161.8 K)
Boiling point 6.8 °C (44.2 °F; 279.9 K)
reacts
Solubility soluble in 1,4-dioxane, ether, xylene, CS2, tetrahydrofuran
1.4538 (6 °C)
0 D
Structure
rhombic
linear
Thermochemistry
66.99 J/mol K
276.1 J/mol K
-93.6 kJ/mol
Related compounds
Related oxides
carbon dioxide
carbon monoxide
dicarbon monoxide
Related compounds
carbon subsulfide
carbon subnitride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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. It is one of the stable members of the series of linear oxocarbons O=Cn=O, which also includes carbon dioxide (CO2) and pentacarbon dioxide (C5O2).

The substance was discovered in 1873 by Benjamin Brodie by subjecting carbon monoxide to an electric current. He claimed that the product was part of a series of "oxycarbons" with formulas Cx+1Ox, namely C, C2O, C3O2, C4O3, C5O4, ..., and to have identified the last two;[1][2] however only C3O2 is known. In 1891 Marcellin Berthelot observed that heating pure carbon monoxide at about 550 °C created small amounts of carbon dioxide but no trace of carbon, and assumed that a carbon-rich oxide was created instead, which he named "sub-oxide". He assumed it was the same product obtained by electric discharge and proposed the formula C2O.[3] Otto Diels later stated that the more organic names dicarbonyl methane and dioxallene were also correct.

It is commonly described as an oily liquid or gas at room temperature with an extremely noxious odor.[4]

Synthesis

It is synthesized by warming a dry mixture of phosphorus pentoxide (P4O10) and malonic acid or the esters of malonic acid.[5] Therefore, it can be also considered as the anhydride of malonic anhydride, i.e. the "second anhydride" of malonic acid. Malonic anhydride (not to be confused with maleic anhydride) is a real molecule.[6]

Several other ways for synthesis and reactions of carbon suboxide can be found in a review from 1930 by Reyerson.[7]

Carbon suboxide polymerizes spontaneously to a red, yellow, or black solid. The structure is postulated to be poly(α-pyronic), similar to the structure in 2-pyrone (α-pyrone).[8][9] In 1969, it was hypothesized that the color of the Martian surface was caused by this compound; this was disproved by the Viking Mars probes (the red color is instead due to iron oxide.)[10]

Uses

Carbon suboxide is used in the preparation of malonates; and as an auxiliary to improve the dye affinity of furs.

Biological role

Those are 6- or 8-ring macrocyclic polymers of carbon suboxide that were found in living organisms. They are acting as an endogenous digoxin-like Na+/K+-ATP-ase and Ca-dependent ATP-ase inhibitors, endogenous natriuretics, antioxidants and antihypertensives

Carbon suboxide, C3O2, can be produced in small amounts in any biochemical process that normally produces carbon monoxide, CO, for example, during heme oxidation by heme oxygenase-1. It can also be formed from malonic acid. It has been shown that carbon suboxide in an organism can quickly polymerize into macrocyclic polycarbon structures with the common formula (C3O2)n (mostly (C3O2)6 and (C3O2)8), and that those macrocyclic compounds are potent inhibitors of Na+/K+-ATP-ase and Ca-dependent ATP-ase, and have digoxin-like physiological properties and natriuretic and antihypertensive actions. Those macrocyclic carbon suboxide polymer compounds are thought to be endogenous digoxin-like regulators of Na+/K+-ATP-ases and Ca-dependent ATP-ases, and endogenous natriuretics and antihypertensives.[11][12][13] Other than that, some authors think also that those macrocyclic compounds of carbon suboxide can possibly diminish free radical formation and oxidative stress and play a role in endogenous anticancer protective mechanisms, for example in the retina.[14]

References

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External links