2,2,4-Trimethylpentane, commonly known as Isooctane, is a branched-chain alkane hydrocarbon. It is a colorless, flammable liquid with a characteristic gasoline-like odor. Isooctane is best known as the standard reference fuel in octane rating, used to define the resistance of gasoline to knocking in internal combustion engines. It also serves as a solvent and intermediate in organic synthesis.
