Isobutane

Isobutane
Names
	IUPAC names Methylpropane; 2-Methylpropane
	Other names Isobutane
Identifiers
CAS Number	75-28-5 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.000.780
E number	E943b (glazing agents, ...)
CompTox Dashboard (EPA)	DTXSID1026401 ;
	SMILES CC(C)C;
Properties
Chemical formula	C4H10
Molar mass	58.124 g·mol−1
Appearance	colorless gas
Density	2.51 kg/m3, gas (15 °C, 1 atm); 593.4 kg/m3, liquid
Melting point	−159.6 °C (−255.3 °F; 113.5 K)
Boiling point	−11.7 °C (10.9 °F; 261.4 K)
Solubility in water	Insoluble
Hazards
NFPA 704 (fire diamond)	1 4
Flash point	flammable gas
Explosive limits	1.8–8.4%
Related compounds
Supplementary data page
	Isobutane (data page)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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. Some portable camp stoves use a mixture of isobutane with propane, usually 80:20. Isobutane 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.

Uses

As a refrigerant.
As a propellant for aerosol cans and foam products, such as reddi wip.

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.{{cite book}}: CS1 maint: multiple names: authors list (link) http://www.acdlabs.com/iupac/nomenclature/93/r93_679.htm

External links

International Chemical Safety Card 0901
NIOSH Pocket Guide to Chemical Hazards
IUPAC Nomenclature of Organic Chemistry (online version of the "Blue Book")
Data from Air Liquide

[1] Patent Watch, July 31, 2006.

[2] Panico, R.; & Powell, W. H. (Eds.) (1994). A Guide to IUPAC Nomenclature of Organic Compounds 1993. Oxford: Blackwell Science. ISBN 0-632-03488-2.{{cite book}}: CS1 maint: multiple names: authors list (link) http://www.acdlabs.com/iupac/nomenclature/93/r93_679.htm

[1]

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