Undecane

Undecane
Names
	Preferred IUPAC name Undecane
Identifiers
CAS Number	1120-21-4 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	1697099
ChEBI	CHEBI:46342 ;
ChEMBL	ChEMBL132474 ;
ChemSpider	13619 ;
ECHA InfoCard	100.013.001
EC Number	214-300-6;
MeSH	undecane
PubChem CID	14257;
RTECS number	YQ1525000;
UNII	JV0QT00NUE ;
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 Key: RSJKGSCJYJTIGS-UHFFFAOYSA-N ;
	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)
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). verify (what is ?) 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.^[4]

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.

References

^ "undecane - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 16 September 2004. Identification and Related Records. Retrieved 5 January 2012.
^ Yaws, Carl L. (1999). Chemical Properties Handbook. New York: McGraw-Hill. pp. 159–179. ISBN 0-07-073401-1.
^ Hölldobler B, Wilson EO (1990). The Ants. Harvard University Press. p. 287. ISBN 0-674-04075-9.
^ Stoermer, Martin (2023). "Undecane Isomers". Figshare. doi:10.6084/M9.FIGSHARE.24309724.