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IUPAC name
Other names
4-Methylpentan-2-ol, Methyl isobutyl carbinol, MIBC, Isobutyl methyl carbinol, 2-Methyl-4-pentanol, 4-methylpentane-2-ol, 1,3-Dimethylbutanol, Methyl amyl alcohol, Isobutyl methyl methanol
108-11-2 YesY=
ChEMBL ChEMBL448896 YesY
ChemSpider 7622 YesY
Jmol-3D images Image
Molar mass 102.174 g/mol
Appearance colorless liquid
Odor mild
Density 0.8075 g/cm3 at 20 °C
Melting point −90 °C (−130 °F; 183 K)
Boiling point 131.6 °C (268.9 °F; 404.8 K)
15 g/L
Solubility soluble in ethanol, diethyl ether
Vapor pressure 0.698 kPa
Viscosity 4.07 mPa·s
273.0 J·mol−1·K−1 (liquid)
-394.7 kJ·mol−1 (liquid)
Flash point 41 °C (106 °F; 314 K)
Explosive limits 1-5.5%[2]
2590 mg/kg (rat, oral)[3]
2000 ppm (rat, 4 hr)[3]
US health exposure limits (NIOSH):
TWA 25 ppm (100 mg/m3) [skin][2]
TWA 25 ppm (100 mg/m3) ST 40 ppm (165 mg/m3) [skin][2]
400 ppm[2]
Related compounds
Related compounds
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

4-Methyl-2-pentanol (IUPAC name) or methyl isobutyl carbinol (MIBC) is an organic chemical compound used primarily as a frother in mineral flotation. It is also used as a solvent, in organic synthesis, and in the manufacture of brake fluid [4] and as a precursor to some plasticizers.


  1. ^ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 3–398, 5–47, 8–106, 15–22, 16–24, ISBN 0-8493-0594-2 
  2. ^ a b c d "NIOSH Pocket Guide to Chemical Hazards #0422". National Institute for Occupational Safety and Health (NIOSH). 
  3. ^ a b "Methyl isobutyl carbinol". Immediately Dangerous to Life and Health. National Institute for Occupational Safety and Health (NIOSH). 
  4. ^ Howard, Philip H. (1993), Handbook of Environmental Fate and Exposure Data for Organic Chemicals 4, Boca Raton, FL: CRC Press, pp. 430–434, ISBN 978-0-87371-413-6, retrieved 2010-01-22