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Skeletal formula Space-filling model
CAS number 95-47-6 YesY
ChemSpider 6967 YesY
UNII Z2474E14QP YesY
DrugBank DB03029
KEGG C07212 YesY
ChEBI CHEBI:28063 YesY
RTECS number ZE2450000
Jmol-3D images Image 1
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
Dipole moment 0.64 D [1]
MSDS External MSDS
EU classification Harmful (Xn) Flammable (F)
R-phrases R11 R20 R21 R38
S-phrases S25
NFPA 704
Flammability code 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g., gasoline) Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point 32 °C (90 °F; 305 K)
Related compounds
Related aromatic hydrocarbons m-xylene
Supplementary data page
Structure and
n, εr, etc.
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Except where noted otherwise, data are 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[edit]


  1. ^ Rudolph, H.D.; Walzer, K.; Krutzik, Irmhild (1973). "Microwave spectrum, barrier for methyl rotation, methyl conformation, and dipole moment of ortho-xylene". Journal of Molecular Spectroscopy 47 (2): 314. doi:10.1016/0022-2852(73)90016-7.