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Mesityl oxide

Mesityl oxide

IUPAC name	IUPAC
Other names	Mesityl oxide Isobutenyl methyl ketone Methyl isobutenyl ketone Isopropylidene acetone
Identifiers
CAS number	141-79-7
RTECS number	SB4200000
SMILES	CC(C)=CC(C)=O
Properties
Molecular formula	C₆H₁₀O
Molar mass	98.14 g/mol
Density	0.858 g/cm³
Melting point	-53 °C
Boiling point	129 °C
Solubility in water	good
Solubility in other solvents	organic solvents
Refractive index (n_D)	1.442
Hazards
Main hazards	flammable
R-phrases	10-20/21/22
S-phrases	25
Flash point	87 °F
Related Compounds
Related compounds	diacetone alcohol acetone, benzylidene acetone
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Mesityl oxide is a ketone with the formula CH₃C(O)CH=C(CH₃)₂. This compound is a colorless, volatile liquid with a strong peppermint odor.

Synthesis

It is prepared by the condensation of acetone to give diacetone alcohol, which readily dehydrates to give this compound. This type of reaction is called aldol reaction.

A further condensation yields isophorone, which is also used as solvent.