环辛四烯 Cyclooctatetraene
（重定向自Tub conformation）
![](/Images/godic/202502/18/Cyclooctatetraen.svg0420.png")
![](/Images/godic/202502/18/Cyclooctatetraene-3d0420.png")
![](/Images/godic/202502/18/Willstaetter_Synthesis_COT.svg0421.png")
![](/Images/godic/202502/18/Reppe_Synthesis_COT.svg0421.png")
环辛四烯（COT）全称“1,3,5,7-环辛四烯”，是环辛烷的完全不饱和衍生物，化学式C8H8。室温下为无色至金黄色液体。属于环状多烯烃，结构与苯相似。
与苯不同的是，环辛四烯不具芳香性。它的化学性质类似于不饱和烃，可以发生加成反应，易加氢生成环辛烷，也容易被氧化和发生聚合。相反苯则易进行亲电取代反应。
Tub conformation
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Cyclooctatetraene 环辛四烯
（重定向自Tub conformation）
![](/Images/godic/202502/18/Cyclooctatetraen.svg0421.png")
![](/Images/godic/202502/18/Cyclooctatetraene-3d0421.png")
![Cyclooctatetraene in its native](/Images/godic/202502/18/All-Z-Cyclooctatetraene_3D_skeletal_formula.svg0421.png")
1,3,5,7-Cyclooctatetraene (COT) is an unsaturated derivative of cyclooctane, with the formula C8H8. It is also known as [8]annulene. This polyunsaturated hydrocarbon is a colorless to light yellow flammable liquid at room temperature. Because of its stoichiometric relationship to benzene, COT has been the subject of much research and some controversy.
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