Isodurene or 1,2,3,5-tetramethylbenzene is an organic compound with the formula C₆H₂(CH₃)₄, classified as an aromatic hydrocarbon. It is a flammable colorless liquid which is nearly insoluble in water but soluble in organic solvents. It occurs naturally in coal tar. Isodurene is one of three isomers of tetramethylbenzene, the other two being prehnitene (1,2,3,4-tetramethylbenzene) and durene (1,2,4,5-tetramethylbenzene).^[1]

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Isodurene

Names
Preferred IUPAC name 1,2,3,5-Tetramethylbenzene
Other names Isodurene
Identifiers
CAS Number	527-53-7
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL1797133
ChemSpider	10245
ECHA InfoCard	100.007.653
EC Number	208-417-1
PubChem CID	10695
UNII	0JBI5Y5A5Z
UN number	1993
CompTox Dashboard (EPA)	DTXSID6026119
InChI InChI=1S/C10H14/c1-7-5-8(2)10(4)9(3)6-7/h5-6H,1-4H3 Key: BFIMMTCNYPIMRN-UHFFFAOYSA-N
SMILES CC1=CC(=C(C(=C1)C)C)C
Properties
Chemical formula	C10H14
Molar mass	134.22
Appearance	colorless liquid
Density	0.89 g/cm3
Melting point	−23.7 °C (−10.7 °F; 249.5 K)
Boiling point	198 °C (388 °F; 471 K)
Solubility in water	27.9 mg/L
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Flammable
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319
Precautionary statements	P264, P280, P302+P352, P305+P351+P338, P321, P332+P313, P337+P313, P362
Flash point	63.3 °C (145.9 °F; 336.4 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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Isoodurene can be prepared from mesitylene, which is converted to mesityl bromide. The latter reacts with magnesium to give the Grignard reagent, which can be alkylated with dimethyl sulfate: ^[2]

Industrially, isodurene can be isolated from the reformed fraction of oil refineries. It may also be produced by methylation of toluene, xylenes, and trimethylbenzenes.^[1]