Triptane

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Triptane

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Template:Longitem	1730756
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UN number	1206
Template:Longitem	Template:Chembox Elements/molecular formula
Molar mass	Template:Chem molar mass
Appearance	Colorless liquid
Odor	Odorless
Density	0.693 g mL−1
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Vapor pressure	23.2286 kPa (at 37.7 °C)
Template:Longitem	4.1 nmol Pa−1 kg−1
Template:Longitem	−88.36·10−6 cm3/mol
Template:Longitem	1.389
Template:Longitem	213.51 J K−1 mol−1
Template:Longitem	292.25 J K−1 mol−1
Template:Longitem	−238.0 – −235.8 kJ mol−1
Template:Longitem	−4.80449 – −4.80349 MJ mol−1
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Explosive limits	1–7%
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Triptane, or 2,2,3-trimethylbutane, is an organic chemical compound with the molecular formula C₇H₁₆ or (H₃C-)₃C-C(-CH₃)₂H. It is therefore an alkane, specifically the most compact and heavily branched of the heptane isomers, the only one with a butane (C₄) backbone.

It was first synthesized in 1922 by Belgian chemists Georges Chavanne (1875–1941) and B. Lejeune, who called it trimethylisopropylmethane.

Due to its high octane rating (112–113 RON, 101 MON) triptane was produced on alkylation units starting from 1943 for use as an anti-knock additive in gasoline. It was extensively researched for this role and received the modern name in the late 1930s at a joint laboratory of NACA, National Bureau of Standards, US Army Air Corps and the Bureau of Aeronautics.

As of 2011, it was not a significant component of US automobile gasoline, present only in trace amounts (0.05–0.1%).

See also

• List of gasoline additives