2-Methylpentane

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2-Methylpentane

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Template:Longitem	Template:Unbulleted list
Template:Longitem	1730735
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MeSH	2-methylpentane
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RTECS number	Template:Unbulleted list
UN number	1208
Template:Longitem	Template:Chembox Elements/molecular formula
Molar mass	Template:Chem molar mass
Appearance	Colorless liquid
Odor	Odorless
Density	653 mg mL−1
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log P	3.608
Vapor pressure	46.7 kPa (at 37.7 °C)
Template:Longitem	5.7 nmol Pa−1 kg−1
Template:Longitem	−75.26·10−6 cm3/mol
Template:Longitem	1.371
Template:Longitem	194.19 J K−1 mol−1
Template:Longitem	290.58 J K−1 mol−1
Template:Longitem	−205.3 – −203.3 kJ mol−1
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Flash point	Template:Chembox CalcTemperatures
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Explosive limits	1.2–7%
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Template:Longitem	2-Ethyl-1-butanol

2-Methylpentane, trivially known as isohexane, is a branched-chain alkane with the molecular formula C₆H₁₄. It is a structural isomer of hexane composed of a methyl group bonded to the second carbon atom in a pentane chain.

As of early 1990s, it was present in American and European gasoline in small amounts, and by 2011 its share in US gas varied between 2 and 8%. Using a quantitative structure-activity relationship (QSAR) prediction model, 2-Methylpentane has a research octane number (RON) of 75, motor octane number (MON) of 77, and cetane number (CN) of 29.

See also

• Heteropoly acid

References

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