2,2-Dimethylpropane
A highly symmetrical five-carbon alkane, also called neopentane.
- Formula
- C5H12
- Functional group
- Alkanes
- Molar mass
- 72.15 g/mol
- Also known as
- NEOPENTANE, Tetramethylmethane, Propane, 2,2-dimethyl-, tert-Pentane, 1,1,1-Trimethylethane, M863R1J0BP
Overview
A highly symmetrical five-carbon alkane, also called neopentane.
Four equivalent methyl groups surround a central carbon with no hydrogen. The compact branched structure has a lower boiling point than pentane. Symmetry and crystal packing also matter for melting, so the boiling trend should not be copied directly to melting points.
Identifiers
- Formula
- C5H12
- Functional group
- Alkanes
- Molar mass
- 72.15 g/mol
- Also known as
- NEOPENTANE, Tetramethylmethane, Propane, 2,2-dimethyl-, tert-Pentane, 1,1,1-Trimethylethane, M863R1J0BP
Chemical identifiers
- SMILES
- CC(C)(C)C
- InChI
- InChI=1S/C5H12/c1-5(2,3)4/h1-4H3
- PubChem CID
- 10041
Properties
- Melting Point
- -16.37 °C
- Boiling Point
- 9.5 °C
- Density
- Density (at 20 °C): 0.61 g/cm³
- Water solubility
- In water, 33.2 mg/L at 25 °C
Related compounds
- Alkanes
A highly symmetrical five-carbon alkane, also called neopentane.
References
- PubChem Compound Summary: 2,2-Dimethylpropane (CID 10041)National Center for Biotechnology Information · PubChem
Identity, molecular formula, molecular weight and aliases retrieved via PUG REST on 2026-09-08.
- OpenStax Organic Chemistry: Properties of alkanesJohn McMurry · OpenStax · 2023
Supports the qualitative structure and reactivity context; identity and numerical measurements retain their original references.
- OpenStax Organic Chemistry: Alkanes and alkane isomersJohn McMurry · OpenStax · 2023
Supports the qualitative structure and reactivity context; identity and numerical measurements retain their original references.
- Hazardous Substances Data Bank (HSDB): 2,2-Dimethylpropane — melting pointHazardous Substances Data Bank (HSDB)
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/10041#section=Melting-Point. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Haynes, W.M. (ed.). CRC Handbook of Chemistry and Physics. 94th Edition. CRC Press LLC, Boca Raton: FL 2013-2014, p. 3-408
- Hazardous Substances Data Bank (HSDB): 2,2-Dimethylpropane — boiling pointHazardous Substances Data Bank (HSDB)
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/10041#section=Boiling-Point. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Haynes, W.M. (ed.). CRC Handbook of Chemistry and Physics. 94th Edition. CRC Press LLC, Boca Raton: FL 2013-2014, p. 3-408
- ILO-WHO International Chemical Safety Cards (ICSCs): 2,2-Dimethylpropane — densityILO-WHO International Chemical Safety Cards (ICSCs)
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/10041#section=Density. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred.
- Hazardous Substances Data Bank (HSDB): 2,2-Dimethylpropane — solubilityHazardous Substances Data Bank (HSDB)
Retrieved through PubChem PUG View on 2026-09-08. https://pubchem.ncbi.nlm.nih.gov/compound/10041#section=Solubility. Source value, complete property clause or compact miscibility statement retained; absent pressure, temperature or phase conditions are not inferred. Original reference: Yalkowsky, S.H., He, Yan, Jain, P. Handbook of Aqueous Solubility Data Second Edition. CRC Press, Boca Raton, FL 2010, p. 177