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|Section2= |Section3= }} Pentenes are alkenes with chemical formula . Each contains one double bond within its molecular structure. There are a total of six different compounds in this class, differing from each other by whether the carbon atoms are attached linearly or in a branched structure, and whether the double bond has a ''cis'' or ''trans'' form. == Straight-chain isomers == 1-Pentene is an alpha-olefin. Most often 1-pentene is made as a byproduct of catalytic or thermal cracking of petroleum, or during production of ethylene and propylene via thermal cracking of hydrocarbon fractions. It is rarely isolated as a separate compound. Instead, it is most often blended into gasoline or, in a mixture with other hydrocarbons, alkylated with isobutane to make gasoline. The only commercial manufacturer of 1-pentene is Sasol Ltd, where it is separated from crude made by the Fischer-Tropsch process. 2-Pentene has two geometric isomers, ''cis''-2-pentene and ''trans''-2-pentene. ''cis''-2-Pentene is used in olefin metathesis. Alternative names for 1-pentene include amylene, ''n''-amylene, and ''n''-pentene. Alternative names for 2-pentene include beta-''n''-amylene and ''sym''-methylethylethylene. 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「pentene」の詳細全文を読む スポンサード リンク
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