o-Xylene

o-Xylene (ortho-xylene) is an aromatic hydrocarbon with the formula C6H4(CH3)2, with two methyl substituents bonded to adjacent carbon atoms of a benzene ring (the ortho configuration). It is a constitutional isomer of m-xylene and p-xylene, the mixture being called xylene or xylenes. o-Xylene is a colourless slightly oily flammable liquid.

o-Xylene
Names
Preferred IUPAC name
1,2-Xylene
Systematic IUPAC name
1,2-Dimethylbenzene
Other names
o-Xylene, o-Xylol
Identifiers
3D model (JSmol)
1815558
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.002.203
EC Number
  • 202-422-2
67796
KEGG
RTECS number
  • ZE2450000
UNII
UN number 1307
  • 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
  • CC1=C(C)C=CC=C1
Properties
C8H10
Molar mass 106.168 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)
0.02% (20°C)
Solubility in ethanol very soluble
Solubility in diethyl ether very soluble
Vapor pressure 7 mmHg (20°C)
-77.78·10−6 cm3/mol
1.50545
Viscosity 1.1049 cP at 0 °C
0.8102 cP at 20 °C
Structure
0.64 D
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
Mildly toxic
GHS labelling:
Danger
H225, H226, H304, H305, H312, H315, H319, H332, H335, H412
P210, P233, P240, P241, P242, P243, P261, P264, P271, P273, P280, P301+P310, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P312, P321, P322, P331, P332+P313, P337+P313, P362, P363, P370+P378, P403+P233, P403+P235, P405, P501
NFPA 704 (fire diamond)
2
3
0
Flash point 32 °C (90 °F; 305 K)
463 °C (865 °F; 736 K)
Explosive limits 0.9%-6.7%
100 ppm (TWA), 150 ppm (STEL)
Lethal dose or concentration (LD, LC):
4300 mg/kg (rats, orally)
6125 ppm (rat, 12 hr)
6125 ppm (human, 12 hr)
NIOSH (US health exposure limits):
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
Safety data sheet (SDS) External MSDS
Related compounds
m-xylene
p-xylene
toluene
Supplementary data page
O-Xylene (data page)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references
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