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|Section2= |Section3= |Section4= |Section5= }} Isobutane (''i''-butane), also known as methylpropane, is a chemical compound with molecular formula and is an isomer of butane. It is the simplest alkane with a tertiary carbon. 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.〔(Patent Watch, July 31, 2006. )〕 ==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''.〔 http://www.acdlabs.com/iupac/nomenclature/93/r93_679.htm〕 Since the longest continuous chain in isobutane contains only three carbon atoms, the full systematic name is 2-methylpropane but the locant (2-) is typically omitted as redundant; C2 is the only position on a propane chain where a methyl substituent can be located without altering the main chain and forming the constitutional isomer ''n''-butane. Image:Butane simple.svg|n-Butane Image:Isobutane4.png|Isobutane (methylpropane) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「isobutane」の詳細全文を読む スポンサード リンク
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