Undecane

Undecane

Names
IUPAC name Undecane
Identifiers
CAS Number	1120-21-4 Y
3D model (Jmol)	Interactive image
Beilstein Reference	1697099
ChEBI	CHEBI:46342 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
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	156.31 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 (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
Specific heat capacity (C)	345.05 J K−1 mol−1
Std molar entropy (So298)	458.15 J K−1 mol−1
Std enthalpy of formation (ΔfHo298)	−329.8–−324.6 kJ mol−1
Std enthalpy of combustion (ΔcHo298)	−7.4339–−7.4287 MJ mol−1
Hazards
GHS pictograms
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 (DSD)	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	Decane Dodecane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
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. 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.