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2-Methylpentane

Names
Preferred IUPAC name 2-Methylpentane
Other names Isohexane
Identifiers
CAS Number	107-83-5
3D model (JSmol)	Interactive image
Beilstein Reference	1730735
ChEBI	CHEBI:88374
ChEMBL	ChEMBL30909
ChemSpider	7604
ECHA InfoCard	100.003.204
EC Number	203-523-4
MeSH	2-methylpentane
PubChem CID	7892
RTECS number	SA2985000
UNII	49IB0U6MLD
UN number	1208
CompTox Dashboard (EPA)	DTXSID4029143
InChI InChI=1S/C6H14/c1-4-5-6(2)3/h6H,4-5H2,1-3H3Key: AFABGHUZZDYHJO-UHFFFAOYSA-N
SMILES CCCC(C)C
Properties
Chemical formula	C6H14
Molar mass	86.178 g·mol
Appearance	Colorless liquid
Odor	Odorless
Density	653 mg mL
Melting point	−160 to −146 °C; −256 to −231 °F; 113 to 127 K
Boiling point	60 to 62 °C; 140 to 143 °F; 333 to 335 K
log P	3.608
Vapor pressure	46.7 kPa (at 37.7 °C)
Henry's law constant (kH)	5.7 nmol Pa kg
Magnetic susceptibility (χ)	-75.26·10 cm/mol
Refractive index (nD)	1.371
Thermochemistry
Heat capacity (C)	194.19 J K mol
Std molar entropy (S298)	290.58 J K mol
Std enthalpy of formation (ΔfH298)	−205.3–−203.3 kJ mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H225, H304, H315, H336, H411
Precautionary statements	P210, P261, P273, P301+P310, P331
NFPA 704 (fire diamond)	2 3 0
Flash point	−7 °C (19 °F; 266 K)
Autoignition temperature	306 °C (583 °F; 579 K)
Explosive limits	1.2–7%
NIOSH (US health exposure limits):
PEL (Permissible)	none
Related compounds
Related alkanes	Isopentane 3-Methylpentane 3-Ethylpentane 2-Methylhexane 3-Methylhexane
Related compounds	2-Ethyl-1-butanol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). N verify (what is  ?) Infobox references

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

1. Haynes, William M. (2010). Handbook of Chemistry and Physics (91 ed.). Boca Raton, Florida, USA: CRC Press. p. 3-364. ISBN 978-1-43982077-3.
2. "2-methylpentane - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 26 March 2005. Identification and Related Records. Retrieved 5 March 2012.
3. NIOSH Pocket Guide to Chemical Hazards. "#0323". National Institute for Occupational Safety and Health (NIOSH).
4. Doskey, Paul V.; Porter, Joseph A.; Scheff, Peter A. (November 1992). "Source Fingerprints for Volatile Non-Methane Hydrocarbons". Journal of the Air & Waste Management Association. 42 (11): 1437–1445. doi:10.1080/10473289.1992.10467090. ISSN 1047-3289.
5. Östermark, Ulf; Petersson, Göran (1992-09-01). "Assessment of hydrocarbons in vapours of conventional and alkylate-based petrol" (PDF). Chemosphere. 25 (6): 763–768. doi:10.1016/0045-6535(92)90066-Z. ISSN 0045-6535.
6. "Hydrocarbon Composition of Gasoline Vapor Emissions from Enclosed Fuel Tanks". nepis.epa.gov. United States Environmental Protection Agency. 2011.
7. Phuong T. M. Do; Steven Crossley; Malee Santikunaporn; Daniel E. Resasco (2007). "Catalytic strategies for improving specific fuel properties". The Royal Society of Chemistry: 38. CiteSeerX 10.1.1.1074.651.

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