2,2,4-Trimethylpentane

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2,2,4-Trimethylpentane
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IUPAC name 2,2,4-Trimethylpentane
Other names Isooctane
Identifiers
CAS number 540-84-1
RTECS number SA3320000
SMILES CC(C)(C)CC(C)C
Properties
Molecular formula C8H18
Molar mass 114.22 g/mol
Appearance colorless liquid
Density 0.688 g/ml, liquid
Melting point

−107.38 °C (165.77 K)

Boiling point

99.3 °C (372.4 K)

Solubility in water Immiscible
Thermochemistry
Std enthalpy of
formation
ΔfHo298
−259 kJ/mol
Std enthalpy of
combustion
ΔcHo298
−5461 kJ/mol
Standard molar
entropy
So298
328 J·K−1·mol−1
Hazards
MSDS MSDS
EU classification Flammable (F)
Harmful (Xn)
Dangerous for
the environment (N)
R-phrases R11, R38,
S-phrases (S2), S9, S16, S29, S33,
S60, S61, S62
Flash point 4.5 °C
Autoignition
temperature
417 °C
Explosive limits 1.1–6.0%
Related Compounds
Related alkanes Heptane
Octane
Related compounds Hexadecane
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

2,2,4-Trimethylpentane, also known as isooctane, is an octane isomer which defines the 100 point on the octane rating scale. It is one of the compounds in petrol/gasoline and has an enthalpy of combustion of -48 kJ/g or -33 kJ/cm³.

Iso-octane, usually as a mixture with related hydrocarbons, is produced on a massive scale in the petrol industry. The alkylation process alkylates isobutane with isobutylene using an acid catalyst (sulfuric acid or hydrofluoric acid). In another process, NExOCTANE, isobutylene is dimerized into iso-octene and hydrogenated to iso-octane.[1]

References

External links

  Template:Hydrocarbon-stub

da:Isooktan de:2,2,4-Trimethylpentanit:Isoottanofi:2,2,4-trimetyylipentaani


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