Names | |
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Preferred IUPAC name
Butane-2,3-dione | |
Other names
Diacetyl
Biacetyl Dimethyl diketone 2,3-Diketobutane | |
Identifiers | |
3D model (JSmol)
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3DMet | |
605398 | |
ChEBI | |
ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.006.428 |
EC Number |
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KEGG | |
PubChem CID
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RTECS number |
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UNII | |
UN number | 2346 |
CompTox Dashboard (EPA)
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Properties | |
C4H6O2 | |
Molar mass | 86.090 g·mol−1 |
Appearance | Yellow liquid |
Density | 0.990 g/mL at 15 °C |
Melting point | −2 to −4 °C (28 to 25 °F; 271 to 269 K) |
Boiling point | 88 °C (190 °F; 361 K) |
200 g/L (20 °C) | |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
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Harmful, flammable |
GHS labelling: | |
Danger | |
H225, H302, H315, H317, H318, H331, H373 | |
P210, P233, P240, P241, P242, P243, P260, P261, P264, P270, P271, P272, P280, P301+P312, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P311, P314, P321, P330, P332+P313, P333+P313, P362, P363, P370+P378, P403+P233, P403+P235, P405, P501 | |
NFPA 704 (fire diamond) | |
Safety data sheet (SDS) | External MSDS |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Diacetyl (/daɪjəˈsiːtəl/ dy-yuh-SEE-tuhl; IUPAC systematic name: butanedione or butane-2,3-dione) is an organic compound with the chemical formula (CH3CO)2. It is a yellow liquid with an intensely buttery flavor. It is a vicinal diketone (two C=O groups, side-by-side). Diacetyl occurs naturally in alcoholic beverages and some cheeses and is added as a flavoring to some foods to impart its buttery flavor.