2,2,4-Trimethylpentane, also known as isooctane or iso-octane, is an organic compound with the formula (CH₃)₃CCH₂CH(CH₃)₂. It is one of several isomers of octane (C8H18). This particular isomer is the standard 100 point on the octane rating scale (the zero point is n-heptane). It is an important component of gasoline, frequently used in relatively large proportions (around 10%) to increase the knock resistance of fuel.
2,2,4-Trimethylpentane is a clear, colorless liquid with a petroleum-like odor. It is less dense than water and insoluble in water. Vapors are heavier than air.
2,2,4-Trimethylpentane is flammable and can ignite at temperatures as low as 212°F (100°C). It is also a skin irritant and can cause respiratory problems if inhaled.
2,2,4-Trimethylpentane is formed by the alkylation reaction of isobutane and isobutene. The reaction is typically carried out in the presence of a catalyst, such as sulfuric acid or anhydrous hydrofluoric acid.
2,2,4-Trimethylpentane is used as a fuel additive, a non-polar solvent, and a nephrotoxin. It is also used as a standard for the octane rating of gasoline.
Here are some additional properties of 2,2,4-trimethylpentane:
- Boiling point: 99°C (210°F)
- Melting point: -56°C (-69°F)
- Density: 690 kg/m³
- Vapor pressure: 41 mmHg (21°C)
- Autoignition temperature: 745°F (393°C)
- Explosive limits: 1.6% – 8.0%
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