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Names | |||
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Preferred IUPAC name
1,2-Xylene[1] | |||
Systematic IUPAC name
1,2-Dimethylbenzene[1] | |||
Other names
o-Xylene,[1] o-Xylol
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Identifiers | |||
3D model (JSmol)
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1815558 | |||
ChEBI | |||
ChEMBL | |||
ChemSpider | |||
DrugBank | |||
ECHA InfoCard | 100.002.203 | ||
EC Number |
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67796 | |||
KEGG | |||
PubChem CID
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RTECS number |
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UNII | |||
UN number | 1307 | ||
CompTox Dashboard (EPA)
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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)[2] | |||
Solubility in ethanol | very soluble | ||
Solubility in diethyl ether | very soluble | ||
Vapor pressure | 7 mmHg (20°C)[2] | ||
-77.78·10−6 cm3/mol | |||
Refractive index (nD)
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1.50545 | ||
Viscosity | 1.1049 cP at 0 °C 0.8102 cP at 20 °C | ||
Structure | |||
0.64 D[3] | |||
Hazards | |||
Occupational safety and health (OHS/OSH): | |||
Main hazards
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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) | |||
Flash point | 32 °C (90 °F; 305 K) | ||
463 °C (865 °F; 736 K)[4] | |||
Explosive limits | 0.9%-6.7%[2] | ||
Threshold limit value (TLV)
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100 ppm[4] (TWA), 150 ppm[4] (STEL) | ||
Lethal dose or concentration (LD, LC): | |||
LD50 (median dose)
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4300 mg/kg (rats, orally)[5] | ||
LCLo (lowest published)
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6125 ppm (rat, 12 hr) 6125 ppm (human, 12 hr)[6] | ||
NIOSH (US health exposure limits): | |||
PEL (Permissible)
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TWA 100 ppm (435 mg/m3)[2] | ||
REL (Recommended)
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TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)[2] | ||
IDLH (Immediate danger)
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900 ppm[2] | ||
Safety data sheet (SDS) | External MSDS | ||
Related compounds | |||
Related aromatic hydrocarbons
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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).
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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.[7]
Petroleum contains about one weight percent xylenes. Most o-xylene is produced by cracking petroleum, which affords a distribution of aromatic compounds, including xylene isomers. m-Xylene is isomerized to o-xylene. Net production was approximately 500,000 tons in the year 2000.
o-Xylene is largely used in the production of phthalic anhydride, which is a precursor to many materials, drugs, and other chemicals.[7] Related to their easy oxidation, the methyl groups are susceptible to halogenation. When treated with elemental bromine, these groups are brominated, yielding xylylene dibromide:[8]
Xylenes are not acutely toxic, for example the LD50 (rat, oral) is 4300 mg/kg. Effects vary with animal and xylene isomer. Concerns with xylenes focus on narcotic effects.[7]