| Identification | Back Directory | [Name]
tricarbon dioxide | [CAS]
504-64-3 | [Synonyms]
1,3-Allenedione
carbon suboxide
tricarbon dioxide
1,3-Dioxopropadiene
Propadiene-1,3-dione
1,2-Propanediene-1,3-dione
1,2-Propadiene-1,3-dione (9CI) | [Molecular Formula]
OC=C=CO | [MOL File]
504-64-3.mol | [Molecular Weight]
68.03 |
| Chemical Properties | Back Directory | [Melting point ]
-111.3° | [Boiling point ]
bp760 6.8° | [density ]
d40 1.114 | [refractive index ]
n0D 1.45384; nD-12 1.46757 | [solubility ]
reacts with H2O | [form ]
colorless gas | [color ]
colorless | [Water Solubility ]
forms malonic acid with H2O [MER06] |
| Hazard Information | Back Directory | [Chemical Properties]
colorless, highly refractive liquid or colorless gas, which burns with a blue sooty flame; odor like acrolein or mustard oil; structure: O=C=C=C=O [MER06] | [Uses]
preparation of malonates; improving dye affinity of fibers. | [Physical properties]
Colorless gas; strong, pungent odor; gas density 2.985 g/L; liquid density 1.114 g/mL at 0°C; refractive index 1.4538 (at 0°C); vapor pressure 588 torr at 0°C; liquefies at 6.8°C; freezes at -111.3°C; burns with a blue sooty flame; reacts with water. The compound is unstable, polymerizing on storage. | [Definition]
ChEBI: Carbon suboxide is a carbon oxide and a member of allenes. | [Preparation]
Carbon suboxide is prepared by dehydration of malonic acid with phosphorus pentoxide in vacuum at 140 to 150°C:
CH2(COOH)2→ C3O2 + 2H2O
Alternatively, the compound may be prepared by thermal dissociation of diacetyltartaric anhydride.
| [Hazard]
Carbon suboxide forms explosive mixtures in air. The lower and upper explosive limits are 6 to 30% by volume in air, respectively. The gas is a strong lacrimator and an irritant to eyes, nose and respiratory tract. Exposure to high concentations is dangerous. . |
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