Undecane

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Undecane

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Template:Longitem	1697099
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MeSH	undecane
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RTECS number	Template:Unbulleted list
UN number	2330
Template:Longitem	Template:Chembox Elements/molecular formula
Molar mass	Template:Chem molar mass
Appearance	Colorless liquid
Odor	Gasoline-like to Odorless
Density	740 g/L
Melting point	Template:Chembox CalcTemperatures
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log P	6.312
Vapor pressure	55 Pa (at 25 °C)
Template:Longitem	5.4 nmol Pa−1 kg−1
Template:Longitem	−131.84·10−6 cm3/mol
Template:Longitem	1.417
Template:Longitem	345.05 J K−1 mol−1
Template:Longitem	458.15 J K−1 mol−1
Template:Longitem	−329.8 – −324.6 kJ mol−1
Template:Longitem	−7.4339 – −7.4287 MJ mol−1
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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.

See also

• Higher alkanes
• List of isomers of undecane
• Cycloundecane

External links

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