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Topic summary

Butanone

Related topics
Names Preferred IUPAC name
Butan-2-one
Other names
  • 2-Butanone
  • Ethyl methyl ketone
  • Ethylmethylketone
  • Methyl ethyl ketone (MEK; deprecated)
  • Methylpropanone
  • Methylacetone
Identifiers
3D model (JSmol)
741880 ChEBI
ChEMBL
ChemSpider
ECHA InfoCard100.001.054EC Number
  • 201-159-0
25656 KEGG
RTECS number
  • EL6475000
UNII
UN number1193
  • InChI=1S/C4H8O/c1-3-4(2)5/h3H2,1-2H3
    Key: ZWEHNKRNPOVVGH-UHFFFAOYSA-N
  • InChI=1/C4H8O/c1-3-4(2)5/h3H2,1-2H3
    Key: ZWEHNKRNPOVVGH-UHFFFAOYAW
  • O=C(C)CC
  • CCC(=O)C
Properties C4H8OMolar mass72.107 g·mol Appearance Colorless liquid OdorMint or acetone-like Density0.8050g/mL Melting point−86 °C (−123 °F; 187 K) Boiling point79.64 °C (175.35 °F; 352.79 K) 27.5g/100mL log P0.37 Vapor pressure78mmHg (20°C) Acidity (pKa) 14.7 −45.58·10 cm/mol 1.37880 Viscosity0.43cPStructure 2.76DHazards GHS labelling: DangerH225, H319, H336P210, P233, P240, P241, P242, P243, P261, P264, P271, P280, P303+P361+P353, P304+P340, P305+P351+P338, P312, P337+P313, P370+P378, P403+P233, P403+P235, P405, P501NFPA 704 (fire diamond)
1
3
0
Flash point−9 °C (16 °F; 264 K) 505 °C (941 °F; 778 K) Explosive limits1.4–11.4% Lethal dose or concentration (LD, LC):
  • 2737mg/kg (oral, rat)
  • 4050mg/kg (oral, mouse)
  • 12667ppm (mammal)
  • 13333ppm (mouse, 2hr)
  • 7833ppm (rat, 8hr)
NIOSH (US health exposure limits):
PEL (Permissible)
TWA 200ppm (590mg/m)
REL (Recommended)
TWA 200ppm (590mg/m) ST 300ppm (885mg/m)
IDLH (Immediate danger)
3000ppm Safety data sheet (SDS) Safety Data SheetRelated compounds
Related ketones
Supplementary data page Butanone (data page)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Butanone, also known as methyl ethyl ketone (MEK) or ethyl methyl ketone, is an organic compound with the formula CH3C(O)CH2CH3. This colorless liquid ketone has a sharp, sweet odor reminiscent of acetone. It is produced industrially on a large scale, but occurs in nature only in trace amounts. It is partially soluble in water, and is commonly used as an industrial solvent. It is an isomer of another solvent, tetrahydrofuran.

Wikipedia source