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Topic summary

2-Methylpentane

2-Methylpentane
Names Preferred IUPAC name
2-Methylpentane
Other names
Isohexane
Identifiers
3D model (JSmol)
1730735 ChEBI
ChEMBL
ChemSpider
ECHA InfoCard100.003.204EC Number
  • 203-523-4
MeSH2-methylpentane
RTECS number
  • SA2985000
UNII
UN number1208
  • InChI=1S/C6H14/c1-4-5-6(2)3/h6H,4-5H2,1-3H3
    Key: AFABGHUZZDYHJO-UHFFFAOYSA-N
  • CCCC(C)C
Properties C6H14Molar mass86.178 g·mol Appearance Colorless liquid OdorOdorless Density653 mg mL Melting point−160 to −146 °C; −256 to −231 °F; 113 to 127 K Boiling point60 to 62 °C; 140 to 143 °F; 333 to 335 K log P3.608 Vapor pressure46.7 kPa (at 37.7 °C) 5.7 nmol Pa kg −75.26·10 cm/mol 1.371 Thermochemistry 194.19 J K mol 290.58 J K mol −205.3 – −203.3 kJ mol Hazards GHS labelling: DangerH225, H304, H315, H336, H411P210, P261, P273, P301+P310, P331NFPA 704 (fire diamond)
2
3
0
Flash point−7 °C (19 °F; 266 K) 306 °C (583 °F; 579 K) Explosive limits1.2–7% NIOSH (US health exposure limits):
PEL (Permissible)
none Related compounds
Related alkanes
Related compounds
2-Ethyl-1-butanol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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2-Methylpentane, trivially known as isohexane, is a branched-chainalkane 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.

Wikipedia source