Mesityl oxide

Mesityl oxide
Names
	Preferred IUPAC name 4-Methylpent-3-en-2-one
	Other names Mesityl oxide; Isobutenyl methyl ketone; Methyl isobutenyl ketone; Isopropylidene acetone
Identifiers
CAS Number	141-79-7 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:89993;
ChEMBL	ChEMBL3185916;
ChemSpider	8526 ;
ECHA InfoCard	100.005.002
EC Number	205-502-5;
PubChem CID	8858;
RTECS number	SB4200000;
UNII	77LAC84669;
UN number	1229
CompTox Dashboard (EPA)	DTXSID1029170;
	InChI InChI=1S/C6H10O/c1-5(2)4-6(3)7/h4H,1-3H3 Key: SHOJXDKTYKFBRD-UHFFFAOYSA-N ; InChI=1/C6H10O/c1-5(2)4-6(3)7/h4H,1-3H3;
	SMILES O=C(\C=C(/C)C)C;
Properties
Chemical formula	C6H10O
Molar mass	98.145 g·mol−1
Appearance	Oily, colorless to light-yellow liquid
Odor	peppermint- or honey-like
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	3% (20°C)
Solubility in other solvents	Soluble in most organic solvents
Vapor pressure	9 mmHg (20°C)
Refractive index (nD)	1.442
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	flammable
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H226, H302, H312, H332
Precautionary statements	P210, P233, P240, P241, P242, P243, P261, P264, P270, P271, P280, P301+P312, P302+P352, P303+P361+P353, P304+P312, P304+P340, P312, P322, P330, P363, P370+P378, P403+P235, P501
Flash point	31 °C; 87 °F; 304 K
Explosive limits	1.4–7.2%
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	1120 mg/kg (rat, oral); 1000 mg/kg (rabbit, oral); 710 mg/kg (mouse, oral)
LC50 (median concentration)	1000 mg/m3 (rat, 4 hr); 9000 mg/m3 (rat, 4 hr); 10,000 mg/m3 (mouse, 2 hr); 2000 mg/m3 (guinea pig, 7 hr)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 25 ppm (100 mg/m3)
REL (Recommended)	TWA 10 ppm (40 mg/m3)
IDLH (Immediate danger)	1400 ppm
Related compounds
Related compounds	diacetone alcohol; acetone,; benzylideneacetone
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) 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 honey-like odor.

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