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| Names | |
|---|---|
| Preferred IUPAC name Benzo[1,2-c:3,4-c′:5,6-c′′]trifuran-1,3,4,6,7,9-hexone | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider |
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| UNII | |
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| Properties | |
| C12O9 | |
| Molar mass | 288.123 g·mol−1 |
| Appearance | colorless solid[1] |
| Melting point | 161 °C; 322 °F; 434 K[1] |
| Vapor pressure | 0.000004 mmHg (20°C)[1] |
| Hazards | |
| NIOSH (US health exposure limits): | |
PEL (Permissible) | none[1] |
REL (Recommended) | TWA 0.005 ppm (0.04 mg/m3) Should be handled in the workplace as an extremely toxic substance.[1] |
IDLH (Immediate danger) | N.D.[1] |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Mellitic anhydride, theanhydride ofmellitic acid, is anorganic compound with the formula C12O9.
Containing no other elements (e.g., hydrogen) besides carbon and oxygen, mellitic anhydride is anoxide ofcarbon (oxocarbon), and, along withCO2,CO, andC3O2, is one of the only four that are reasonably stable under standard conditions. It is a white sublimable solid, apparently obtained byJustus Liebig andFriedrich Wöhler in 1830 in their study ofmellite ("honey stone") and has theempirical formula C4O3.[2][3][4] The substance was properly characterized in 1913 by H. Meyer and K. Steiner.[5][6] It retains the aromatic character of the benzene ring.[7][8]
