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Chemical compound From Wikipedia, the free encyclopedia
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.
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Names | |||
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Preferred IUPAC name
2,2,3-Trimethylbutane[1] | |||
Identifiers | |||
3D model (JSmol) |
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1730756 | |||
ChemSpider | |||
ECHA InfoCard | 100.006.680 | ||
EC Number |
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PubChem CID |
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UNII | |||
UN number | 1206 | ||
CompTox Dashboard (EPA) |
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Properties | |||
C7H16 | |||
Molar mass | 100.205 g·mol−1 | ||
Appearance | Colorless liquid | ||
Odor | Odorless | ||
Density | 0.693 g mL−1 | ||
Melting point | −26 to −24 °C; −15 to −11 °F; 247 to 249 K | ||
Boiling point | 80.8 to 81.2 °C; 177.3 to 178.1 °F; 353.9 to 354.3 K | ||
Vapor pressure | 23.2286 kPa (at 37.7 °C) | ||
Henry's law constant (kH) |
4.1 nmol Pa−1 kg−1 | ||
-88.36·10−6 cm3/mol | |||
Refractive index (nD) |
1.389 | ||
Thermochemistry | |||
Heat capacity (C) |
213.51 J K−1 mol−1 | ||
Std molar entropy (S⦵298) |
292.25 J K−1 mol−1 | ||
Std enthalpy of formation (ΔfH⦵298) |
−238.0 – −235.8 kJ mol−1 | ||
Std enthalpy of combustion (ΔcH⦵298) |
−4.80449 – −4.80349 MJ mol−1 | ||
Hazards | |||
GHS labelling: | |||
Danger | |||
H225, H302, H305, H315, H336, H400 | |||
P210, P261, P273, P301+P310, P331 | |||
NFPA 704 (fire diamond) | |||
Flash point | −7 °C (19 °F; 266 K) | ||
450 °C (842 °F; 723 K) | |||
Explosive limits | 1–7% | ||
Related compounds | |||
Related alkanes |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Due to its high octane rating (112.8 RON, 101.3 MON[2]) triptane has been produced on alkylation units since 1943[3] for use as an anti-knock additive in gasoline.
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