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Skeletal formula of undecane
Skeletal formula of undecane with all implicit carbons shown, and all explicit hydrogens added
Ball and stick model of undecane
CAS number 1120-21-4 YesY
PubChem 14257
ChemSpider 13619 YesY
EC number 214-300-6
UN number 2330
MeSH undecane
ChEBI CHEBI:46342 YesY
RTECS number YQ1525000
Beilstein Reference 1697099
Jmol-3D images Image 1
Molecular formula C11H24
Molar mass 156.31 g mol−1
Appearance Colorless liquid
Odor Gasoline-like to Odorless
Density 740 mg mL−1
Melting point −26.6 to −25.0 °C; −15.8 to −12.9 °F; 246.6 to 248.2 K
Boiling point 193 to 197 °C; 379 to 386 °F; 466 to 470 K
log P 6.312
Vapor pressure 55 Pa[2]
kH 5.4 nmol Pa−1 kg−1
Refractive index (nD) 1.417
heat capacity
345.05 J K−1 mol−1
Std molar
458.15 J K−1 mol−1
Std enthalpy of
−329.8–−324.6 kJ mol−1
Std enthalpy of
−7.4339–−7.4287 MJ mol−1
GHS pictograms The skull-and-crossbones pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) The health hazard pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)
GHS signal word DANGER
GHS hazard statements H304, H315, H319, H331, H335
GHS precautionary statements P261, P301+310, P305+351+338, P311, P331
EU classification Harmful Xn
R-phrases R36/37/38, R65
S-phrases S26, S36
Flash point 62.0 °C (143.6 °F; 335.1 K)
Related compounds
Related alkanes
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

Undecane (also known as hendecane) is a liquid alkane hydrocarbon with the chemical formula CH3(CH2)9CH3. It is used as a mild sex attractant for various types of moths and cockroaches, and an alert signal for a variety of ants.[3] It has 159 isomers.

Undecane may also be used as an internal standard in gas chromatography when working with other hydrocarbons. Since the boiling point of undecane (196°C) is well known, it may be used as a comparison for retention times in a gas chromatograph for molecules whose structure has been freshly elucidated. For example, if one is working with a 50 m crosslinked methyl silicone capillary column with an oven temperature increasing slowly, beginning around 60°C, an 11-carbon molecule like undecane may be used as an internal standard to be compared with the retention times of other 10-, 11-, or 12- carbon molecules, depending on their structures.

See also[edit]


  1. ^ "undecane - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 16 September 2004. Identification and Related Records. Retrieved 5 January 2012. 
  2. ^ Yaws, Carl L. (1999). Chemical Properties Handbook. New York: McGraw-Hill. pp. 159–179. ISBN 0-07-073401-1. 
  3. ^ Hölldobler B, Wilson EO (1990). The Ants. Harvard University Press. ISBN 0-674-04075-9, p. 287

External links[edit]

  • Undecane at Dr. Duke's Phytochemical and Ethnobotanical Databases