Undecane

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.^[4]

Undecane

Names
Preferred IUPAC name Undecane[1]
Identifiers
CAS Number	1120-21-4 Y
3D model (JSmol)	Interactive image
Beilstein Reference	1697099
ChEBI	CHEBI:46342 Y
ChEMBL	ChEMBL132474 Y
ChemSpider	13619 Y
ECHA InfoCard	100.013.001
EC Number	214-300-6
MeSH	undecane
PubChem CID	14257
RTECS number	YQ1525000
UNII	JV0QT00NUE Y
UN number	2330
CompTox Dashboard (EPA)	DTXSID9021689
InChI InChI=1S/C11H24/c1-3-5-7-9-11-10-8-6-4-2/h3-11H2,1-2H3 Y Key: RSJKGSCJYJTIGS-UHFFFAOYSA-N Y
SMILES CCCCCCCCCCC
Properties
Chemical formula	C11H24
Molar mass	156.313 g·mol−1
Appearance	Colorless liquid
Odor	Gasoline-like to Odorless
Density	740 g/L
Melting point	−26 °C (−15 °F; 247 K)
Boiling point	196 °C (385 °F; 469 K)
log P	6.312
Vapor pressure	55 Pa (at 25 °C)[2]
Henry's law constant (kH)	5.4 nmol Pa−1 kg−1
Magnetic susceptibility (χ)	−131.84·10−6 cm3/mol
Refractive index (nD)	1.417
Thermochemistry
Heat capacity (C)	345.05 J K−1 mol−1
Std molar entropy (S⦵298)	458.15 J K−1 mol−1
Std enthalpy of formation (ΔfH⦵298)	−329.8 – −324.6 kJ mol−1
Std enthalpy of combustion (ΔcH⦵298)	−7.4339 – −7.4287 MJ mol−1
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H304, H315, H319, H331, H335
Precautionary statements	P261, P301+P310, P305+P351+P338, P311, P331
NFPA 704 (fire diamond)	3 2 0
Flash point	60.0 °C (140.0 °F; 333.1 K)
Autoignition temperature	240 °C (464 °F; 513 K)
Lethal dose or concentration (LD, LC):
LD50 (median dose)	> 2000 mg/kg (rat, oral) > 5000 mg/kg (rat, dermal)
LC50 (median concentration)	> 20 mg/L (rat, 8 hours)
Safety data sheet (SDS)	Fisher Scientific
Related compounds
Related alkanes	Decane Dodecane
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

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

• Higher alkanes
• List of isomers of undecane
• Cycloundecane