Isooctane
Structural Formula Vector Image
Title: Isooctane
CAS Registry Number: 540-84-1
CAS Name: 2,2,4-Trimethylpentane
Additional Names: isobutyltrimethylmethane
Molecular Formula: C8H18
Molecular Weight: 114.23
Percent Composition: C 84.12%, H 15.88%
Line Formula: (CH3)3CCH2CH(CH3)2
Literature References: Produced by the refining of petroleum.
Properties: Highly flammable, mobile liquid. Odor of gasoline. Antiknock octane no. 100. mp -107.45°. bp 99.3°. d420 0.69194. nD20 1.39157. Dipole moment: 0. Flash pt, closed cup: 10°F (-12°C). Practically insol in water; somewhat sol in abs alcohols; sol in benzene, toluene, xylene, chloroform, ether, carbon disulfide, carbon tetrachloride, DMF and oils, except castor oil.
Melting point: mp -107.45°
Boiling point: bp 99.3°
Flash point: Flash pt, closed cup: 10°F (-12°C)
Index of refraction: nD20 1.39157
Density: d420 0.69194
NOTE: The name isooctane has also been applied to 2-methylheptane.
Use: In determining octane numbers of fuels; in spectrophotometric analysis; as solvent and thinner.

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