O-Cymene

o-Cymene is an organic compound classified as an aromatic hydrocarbon. Its structure consists of a benzene ring ortho-substituted with a methyl group and an isopropyl group. It is a flammable colorless liquid which is nearly insoluble in water but soluble in organic solvents.

o-Cymene

Names
Preferred IUPAC name 1-Methyl-2-(propan-2-yl)benzene
Other names o-Cymene 2-isopropyltoluene 2-methylcumene 1-isopropyl-2-methylbenzene
Identifiers
CAS Number	527-84-4 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:28768
ChemSpider	10253
EC Number	208-426-0
PubChem CID	10703
UNII	2T13HF3266 Y
InChI InChI=1S/C10H14/c1-8(2)10-7-5-4-6-9(10)3/h4-8H,1-3H3 Key: WWRCMNKATXZARA-UHFFFAOYSA-N
SMILES CC1=CC=CC=C1C(C)C
Properties
Chemical formula	C10H14
Molar mass	134.22
Appearance	colorless liquid
Density	0.88 g/cm3
Melting point	−71.5 °C (−96.7 °F; 201.7 K)
Boiling point	178 °C (352 °F; 451 K)
Solubility in water	23.3 mg/L
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Flammable
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H226
Precautionary statements	P210, P233, P240, P241, P242, P243, P280, P303+P361+P353, P370+P378, P403+P235, P501
Flash point	50.6 °C (123.1 °F; 323.8 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Isomers and production

In addition to o-cymene, there are two other geometric isomers called m-cymene, in which the alkyl groups are meta-substituted, and p-cymene, in which they are para-substituted. p-Cymene is the only isomer found in nature. The three isomers form the group of cymenes.

Cymenes can be produced by alkylation of toluene with propylene.^[1][2]