Diacetyl

Diacetyl^[1]

Names
Preferred IUPAC name Butane-2,3-dione
Other names Diacetyl Biacetyl Dimethyl diketone 2,3-Diketobutane
Identifiers
CAS Number	431-03-8 Y
3D model (JSmol)	Interactive image
3DMet	B00164
Beilstein Reference	605398
ChEBI	CHEBI:16583 Y
ChEMBL	ChEMBL365809 Y
ChemSpider	630 Y
ECHA InfoCard	100.006.428
EC Number	207-069-8
KEGG	C00741 Y
PubChem CID	650
RTECS number	EK2625000
UNII	K324J5K4HM Y
UN number	2346
CompTox Dashboard (EPA)	DTXSID6021583
InChI InChI=1S/C4H6O2/c1-3(5)4(2)6/h1-2H3 Y Key: QSJXEFYPDANLFS-UHFFFAOYSA-N Y InChI=1/C4H6O2/c1-3(5)4(2)6/h1-2H3 Key: QSJXEFYPDANLFS-UHFFFAOYAX
SMILES CC(=O)C(=O)C
Properties
Chemical formula	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)
Solubility in water	200 g/L (20 °C)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Harmful, flammable
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H225, H302, H315, H317, H318, H331, H373
Precautionary statements	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)	2 3 0
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). Y verify (what is YN ?) Infobox references

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.