Neopentane

Neopentane, also called 2,2‑dimethylpropane, is an organic compound. It is one of the isomers of pentane, the hydrocarbon with chemical formula C5H12. T

Neopentane
Neopentane
Names
Preferred IUPAC name
2,2-Dimethylpropane
Other names
  • Tetramethylmethane
  • Dimethylpropane
Identifiers
3D model (JSmol)
Beilstein Reference 1730722
ChEBI
ChemSpider
ECHA InfoCard 100.006.677
EC Number
  • 207-343-7
Gmelin Reference 1850
MeSH neopentane
UNII
UN number 2044
  • CC(C)(C)C
Properties
C(CH3)4
Molar mass 72.15 g·mol−1
Appearance Colorless gas
Odor Odorless
Density 3.255 kg/m3 (gas, 9.5 °C)
601.172 kg/m3 (liquid, 9.5 °C)
Melting point −16.5 °C (2.3 °F; 256.6 K)
Boiling point 9.5 °C (49.1 °F; 282.6 K)
Vapor pressure 146 kPa (at 20 °C)[1]
kH 4.7 nmol Pa−1 kg−1
Thermochemistry
Std enthalpy of
formation ΔfHo298 		−168.5–−167.3 kJ mol−1
Std enthalpy of
combustion ΔcHo298 		−3.51506–−3.51314 MJ mol−1
Standard molar
entropy So298 		217 J K−1 mol−1
Specific heat capacity, C 121.07–120.57 J K−1 mol−1
Hazards
GHS labelling:
GHS02: FlammableGHS09: Environmental hazard
Danger
H220, H411
P210, P273, P377, P381, P391, P403, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propaneInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
4
0
Related compounds
Related alkanes
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references


Neopentane, also called 2,2‑dimethylpropane, is an organic compound. It is one of the isomers of pentane, the hydrocarbon with chemical formula C5H12. The formula is also written as C(CH3)4.

Neopentane is the simplest chemical to have a quaternary carbon atom.

  1. ↑ "Neopentane | C5H12 - PubChem".

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