Ortho-xylene

o-Xylene

Names
Preferred IUPAC name 1,2-Xylene
Systematic IUPAC name 1,2-Dimethylbenzene
Other names o-Xylene
Identifiers
CAS Number	95-47-6 Y
3D model (Jmol)	Interactive image
ChEBI	CHEBI:28063 Y
ChemSpider	6967 Y
DrugBank	DB03029 Y
ECHA InfoCard	100.002.203
KEGG	C07212 Y
RTECS number	ZE2450000
UNII	Z2474E14QP 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
SMILES CC1=C(C)C=CC=C1
Properties
Chemical 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	0.02% (20°C)
Solubility in ethanol	very soluble
Solubility in diethyl ether	very soluble
Vapor pressure	7 mmHg (20°C)
Magnetic susceptibility (χ)	-77.78·10−6 cm3/mol
Refractive index (nD)	1.50545
Viscosity	1.1049 cP at 0 °C 0.8102 cP at 20 °C
Structure
Dipole moment	0.64 D
Hazards
Safety data sheet	See: data page External MSDS
EU classification (DSD)	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)
Autoignition temperature	463 °C (865 °F; 736 K)
Explosive limits	0.9%-6.7%
Threshold limit value	100 ppm (TWA), 150 ppm (STEL)
Lethal dose or concentration (LD, LC):
LCLo (lowest published)	6125 ppm (rat, 12 hr) 6125 ppm (human, 12 hr)
US health exposure limits (NIOSH):
PEL (Permissible)	TWA 100 ppm (435 mg/m3)
REL (Recommended)	TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)
IDLH (Immediate danger)	900 ppm
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 otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
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.