2,5-Dimethylhexane is a branched alkane used in the aviation industry in low revolutions per minute helicopters.[2] As an isomer of octane, the boiling point is very close to that of octane, but can in pure form be slightly lower. 2,5-Dimethylhexane is moderately toxic.

2,5-Dimethylhexane
Skeletal formula of 2,5-dimethylhexane
Ball and stick model of 2,5-dimethylhexane
Names
Preferred IUPAC name
2,5-Dimethylhexane[1]
Identifiers
3D model (JSmol)
1696877
ChemSpider
ECHA InfoCard 100.008.861 Edit this at Wikidata
EC Number
  • 209-745-8
UNII
UN number 3295
  • InChI=1S/C8H18/c1-7(2)5-6-8(3)4/h7-8H,5-6H2,1-4H3 checkY
    Key: UWNADWZGEHDQAB-UHFFFAOYSA-N checkY
  • CC(C)CCC(C)C
Properties
C8H18
Molar mass 114.232 g·mol−1
Appearance Colourless liquid
Odor Odourless
Density 694 mg mL−1
Melting point −93 to −89 °C; −136 to −128 °F; 180 to 184 K
Boiling point 108.1 to 109.9 °C; 226.5 to 229.7 °F; 381.2 to 383.0 K
Vapor pressure 7.582 kPa (at 37.7 °C)
3.0 nmol Pa−1 kg−1
-98.15·10−6 cm3/mol
1.392
Thermochemistry
249.20 J K−1 mol−1
−262.0–−259.0 kJ mol−1
−5.4615–−5.4587 MJ mol−1
Hazards
GHS labelling:
GHS02: Flammable GHS07: Exclamation mark GHS08: Health hazard GHS09: Environmental hazard
Danger
H225, H304, H315, H336, H410
P210, P261, P273, P301+P310, P331
Flash point 26 °C (79 °F; 299 K)
Explosive limits 0.98–?%
Related compounds
Related alkanes
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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References

edit
  1. ^ "2,5-DIMETHYLHEXANE - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 26 March 2005. Identification and Related Records. Retrieved 12 March 2012.
  2. ^ Sarathy, S. Mani; Javed, Tamour; Karsenty, Florent; Heufer, Alexander; Wang, Weijing; Park, Sungwoo; Elwardany, Ahmed; Farooq, Aamir; Westbrook, Charles K.; Pitz, William J.; Oehlschlaeger, Matthew A.; Dayma, Guillaume; Curran, Henry J.; Dagaut, Philippe (2014-01-16). "A comprehensive combustion chemistry study of 2,5-dimethylhexane". Combustion and Flame. 161 (6): 1444–1459. Bibcode:2014CoFl..161.1444S. doi:10.1016/j.combustflame.2013.12.010. hdl:10754/563566. ISSN 0010-2180. OSTI 1755830. S2CID 96077924.