o-Xylene

o-Xylene

Identifiers
CAS Registry Number	95-47-6 Y
ChEBI	CHEBI:28063 Y
ChEMBL	ChEMBL45005 Y
ChemSpider	6967 Y
DrugBank	DB03029 Y
InChI InChI=1S/C8H10/c1-7-5-3-4-6-8(7)2/h3-6H,1-2H3 Y Key: CTQNGGLPUBDAKN-UHFFFAOYSA-N Y InChI=1/C8H10/c1-7-5-3-4-6-8(7)2/h3-6H,1-2H3 Key: CTQNGGLPUBDAKN-UHFFFAOYAE
Jmol-3D images	Image
KEGG	C07212 Y
RTECS number	ZE2450000
SMILES CC1=C(C)C=CC=C1
UNII	Z2474E14QP Y
Properties
Molecular formula	C8H10
Molar mass	106.17 g·mol−1
Appearance	Colorless liquid
Density	0.88 g/ml
Melting point	−24 °C (−11 °F; 249 K)
Boiling point	144.4 °C (291.9 °F; 417.5 K)
Solubility in water	insoluble
Solubility in ethanol	very soluble
Solubility in diethyl ether	very soluble
Refractive index (nD)	1.50545
Viscosity	1.1049 cP at 0 °C 0.8102 cP at 20 °C
Structure
Dipole moment	0.64 D [1]
Hazards
MSDS	External MSDS
EU classification	Harmful (Xn) Flammable (F)
R-phrases	R11 R20 R21 R38
S-phrases	S25
NFPA 704	3 2 0
Flash point	32 °C (90 °F; 305 K)
Explosive limits	0.9%-6.7%[2]
US health exposure limits (NIOSH):
PEL (Permissible)	TWA 100 ppm (435 mg/m3)[2]
Related compounds
Related aromatic hydrocarbons	m-xylene p-xylene toluene
Supplementary data page
Structure and properties	Refractive index (n), Dielectric constant (εr), etc.
Thermodynamic data	Phase behaviour solid–liquid–gas
Spectral data	UV, IR, NMR, MS
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

o-Xylene (ortho-xylene) is an aromatic hydrocarbon, based on benzene with two methyl substituents bonded to adjacent carbon atoms in the aromatic ring (the ortho configuration).

It is a constitutional isomer of m-xylene and p-xylene.

o-Xylene is largely used in the production of phthalic anhydride, and is generally extracted by distillation from a mixed xylene stream in a plant primarily designed for p-xylene production.

See also

• Xylene

References