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| Isobutane | |
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| IUPAC name | Isobutane Methylpropane |
| Other names | 2-Methylpropane |
| Identifiers | |
| CAS number | [75-28-5] |
| SMILES |
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| Properties | |
| Molecular formula | C4H10 |
| Molar mass | 58.12 g mol-1 |
| Appearance | colorless gas |
| Density | 2.51 g/l, gas (15 °C, 1 atm);593.4 kg · m-3, liquid |
| Melting point |
-159.6 °C, 114 K, -255 °F |
| Boiling point |
-11.7 °C, 261 K, 11 °F |
| Solubility in water | Insoluble |
| Hazards | |
| MSDS | External MSDS |
| MSDS | External MSDS |
| EU classification | Highly flammable (F+) |
| NFPA 704 |
 4
1
0
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| R-phrases | R12 |
| S-phrases | (S2), S9, S16 |
| Flash point | flammable gas |
| Autoignition temperature |
460 °C |
| Explosive limits | 1.8–8.4% |
| Related compounds | |
| Related alkane | Butane |
| Related compounds | Isopentane Neopentane |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references |
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Isobutane, also known as methylpropane or 2-methylpropane, is an alkane, isomeric with butane. Recent concerns with depletion of the ozone layer by freon gases have led to increased use of isobutane as a gas for refrigeration systems, especially in domestic refrigerators and freezers, and as a propellant in aerosol sprays. When used as a refrigerant or a propellant, isobutane is also known as R-600a. It is used as a feedstock in the petrochemical industry, for example in the synthesis of isooctane.[1]
Its UN number (for hazardous substances see shipping) is UN 1969. Isobutane is the R group for the amino acid Leucine
Nomenclature
Isobutane is the trivial name retained by the International Union of Pure and Applied Chemistry (IUPAC) in its 1993 Recommendations for the Nomenclature of Organic Chemistry.[2]
Methylpropane is the systematic name. The substituent number (2-) is unnecessary because there is no isomer of this molecule with methylpropane as part of its name.
References
- ^ Patent Watch, July 31, 2006.
- ^ Panico, R.; & Powell, W. H. (Eds.) (1994). A Guide to IUPAC Nomenclature of Organic Compounds 1993. Oxford: Blackwell Science. ISBN 0-632-03488-2. http://www.acdlabs.com/iupac/nomenclature/93/r93_679.htm
External links
- IUPAC Nomenclature of Organic Chemistry (online version of the "Blue Book")
- Molview from bluerhinos.co.uk See Isobutane in 3D
- Data from Air Liquide
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Wikipedia content modification information:
- This page was last modified on 4 June 2008, at 09:03.
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