Butanone

Butanone, also called methyl ethyl ketone (MEK), is an organic compound with the chemical formula CH₃C(O)CH₂CH₃. It is a simple ketone with four carbon atoms. It smells sharp and sweet, like butterscotch and acetone mixed. It is soluble in water and is used as a solvent.

Butanone^[1]

Ball-and-stick model of butanone Space-filling model of butanone
Names
Preferred IUPAC name Butan-2-one[2]
Other names Ethyl methyl ketone[2] Ethylmethylketone Methyl ethyl ketone (MEK; deprecated[2]) Methylpropanone Methylacetone
Identifiers
CAS Number	78-93-3 Y
3D model (JSmol)	Interactive image Interactive image
Beilstein Reference	741880
ChEBI	CHEBI:28398 Y
ChEMBL	ChEMBL15849 Y
ChemSpider	6321 Y
ECHA InfoCard	100.001.054
Gmelin Reference	25656
KEGG	C02845 Y
PubChem CID	6569
RTECS number	EL6475000
UNII	6PT9KLV9IO Y
CompTox Dashboard (EPA)	DTXSID3021516
SMILES O=C(C)CC CCC(=O)C
Properties
Chemical formula	C4H8O
Molar mass	72.11 g·mol−1
Appearance	Colorless liquid
Odor	Mint or acetone-like[3]
Density	0.8050 g/mL
Melting point	−86 °C (−123 °F; 187 K)
Boiling point	79.64 °C (175.35 °F; 352.79 K)
Solubility in water	27.5 g/100 mL
log P	0.37[4]
Vapor pressure	78 mmHg (20 °C)[3]
Acidity (pKa)	14.7
Magnetic susceptibility (χ)	−45.58·10−6 cm3/mol
Refractive index (nD)	1.37880
Viscosity	0.43 cP
Structure
Dipole moment	2.76 D
Hazards
EU classification	Flammable (F) Irritant (Xi)
NFPA 704	3 1 0
R-phrases	R11 R36 R66 R67
S-phrases	(S2) S9 S16
Explosive limits	1.4–11.4%[3]
U.S. Permissible exposure limit (PEL)	TWA 200 ppm (590 mg/m3)[3]
Related compounds
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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

References

1. Merck Index, 11th Edition, 5991.
2. Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 725. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.
3. NIOSH Pocket Guide to Chemical Hazards. "#0069". National Institute for Occupational Safety and Health (NIOSH).
4. "butan-2-one_msds".