Mesityl oxide

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Mesityl oxide
Mesityl oxide
CAS number 141-79-7 YesY
ChemSpider 8526 YesY
RTECS number SB4200000
Jmol-3D images Image 1
Molecular formula C6H10O
Molar mass 98.14 g mol−1
Appearance Straw-yellow liquid
Density 0.858 g/cm³
Melting point −53 °C (−63 °F; 220 K)
Boiling point 129.5 °C (265.1 °F; 402.6 K)
Solubility in water Good
Solubility in other solvents Soluble in most organic solvents
Refractive index (nD) 1.442
R-phrases R10 R20/21/22
S-phrases S25
Main hazards flammable
Related compounds
Related compounds diacetone alcohol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Mesityl oxide is a α,β-Unsaturated ketone with the formula CH3C(O)CH=C(CH3)2. This compound is a colorless, volatile liquid with a strong peppermint odor.[1]


It is prepared by the aldol condensation of acetone to give diacetone alcohol, which readily dehydrates to give this compound.[2]

Acetone mesityl oxide.png

Isophorone may be formed under the same conditions of mesityl oxide production, by a Michael addition. The yields of mesityl oxide and isophorone may vary according to reaction conditions during synthesis:

Isophorone mesityl oxide.png


Mesityl oxide is used as a solvent and in the production of methyl isobutyl ketone by hydrogenation:

Hydrogenation of mesityl oxide to MIBK.png


  1. ^ Merck Index, 11th Edition, 5811
  2. ^ J. B. Conant and Neal Tuttle (1941), "Mesityl oxide", Org. Synth. ; Coll. Vol. 1: 345 

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