5-Methyl-2-hexanon - 5-Methyl-2-hexanon

Structural formula
Structural formula of 5-methyl-2-hexanone
Name 5-Methyl-2-hexanon
other names
  • 5-Methylhexan-2-on
  • MIAK
  • Isopentylmethylketon
  • Methylisoamylketon
Sum formula C 7 H 14 O
Brief description

colorless liquid with a pleasant odor [1]

External identifiers / databases
CAS number 110-12-3
EC number 203-737-8
ECHA-InfoCard 100.003.399
PubChem 8034
Wikidata Q2152381
Molar mass 114.19 g · mol −1
Physical state

liquid [1]


0,89 g·cm−3[1]

Melting point

−74 °C[1]

boiling point

144 °C[1]

Vapor pressure

6,43 hPa (20 °C)[1]


sparingly soluble in water (approx. 3.1 g l −1 at 25 ° C) [1]

Refractive index

1,4075 (20 °C)[2]

safety instructions
GHS hazardous substance labeling from Regulation (EC) No. 1272/2008 (CLP) , [3] possibly extended [1]
02 - Highly / extremely flammable 07 - Warning


H and P phrases H: 226​‐​332
P: 210​‐​304+340 [1]
Toxicological data
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

5-methyl-2-hexanone is a chemical compound from the group of ketones .


5-Methyl-2-hexanone was found in traces of the volatile substances in papaya (Carica papaya) [4] [5] , black tea and cooked meat. [6]

Extraction and presentation

5-methyl-2-hexanone can be obtained by oxidation of 5-methyl-2-hexanol or by condensation of acetone with isobutyraldehyde . [7]


5-methyl-2-hexanone is a colorless liquid with a pleasant odor that is sparingly soluble in water. [1]


5-methyl-2-hexanone is used as an industrial intermediate in the manufacture of rubber antioxidants, pharmaceuticals, agrochemicals, paints and varnishes, and as a solvent . [7] [2]

safety instructions

The vapors of 5-methyl-2-hexanone can form an explosive mixture with air ( flash point 35 ° C, ignition temperature 455 ° C). [1]

Individual evidence

  1. a b c d e f g h i j k l m Entry on 5-methyl-2-hexanone in the GESTIS substance database of the IFA , accessed on December 3, 2018(JavaScript required) .
  2. a b Data sheet 5-Methyl-2-hexanone, 99% from AlfaAesar, accessed on December 3, 2018 ( PDF )(JavaScript required) .
  3. Entry on 5-methylhexan-2-one in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on December 3, 2018. Manufacturers or distributors can expand the harmonized classification and labeling .
  4. Jorge A. Pino, Karina Almora, Rolando Marbot: Volatile components of papaya (Carica papaya L., Maradol variety) fruit. In: Flavour and Fragrance Journal. 18, 2003, S. 492, doi:10.1002/ffj.1248.
  5. Peter Schreier, Mathias Lehr et al: About the aroma of the papaya fruit (Carica papaya, L.): Notes on precursors of volatile terpene compounds. In: Journal of Food Study and Research. 180, 1985, p. 297, doi : 10.1007 / BF01851273 .
  6. Shmuel Yannai: Dictionary of Food Compounds with CD-ROM, Second Edition. CRC Press, 2012, ISBN 978-1-4200-8351-4, S. 1305 ( limited preview in Google Book Search).
  7. a b Entry on 5-methyl-2-hexanone in the Hazardous Substances Data Bank , accessed on December 3, 2018.