<h2><span id=".E5.91.BD.E5.90.8D"></span><span id="命名">命名</span></h2>
<p>由於雙鍵在第二個碳原子上，因此為2-丁烯。然中間的雙鍵無法旋轉，兩邊的甲基和氫原子互在反位，因而得名。<br>
英文名稱為<b>trans-2-Butene</b>(反-2-丁烯)
</p>
<h2><span id=".E7.B5.90.E6.A7.8B"></span><span id="結構">結構</span></h2>
<ul class="gallery mw-gallery-traditional"><li class="gallerybox" style="width: 155px">
</ul><h2><span id=".E5.8F.96.E5.BE.97"></span><span id="取得">取得</span></h2>
<p>由第二丁基氯之去鹵化氫反應形成<b>反-2-丁烯</b>，副產物為氯離子和水分子<br><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \ C_{4}H_{9}Cl+OH^{-}\to C_{4}H_{8}+Cl^{-}+H_{2}O}">
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    <annotation encoding="application/x-tex">{\displaystyle \ C_{4}H_{9}Cl+OH^{-}\to C_{4}H_{8}+Cl^{-}+H_{2}O}</annotation>
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此反應仍會產生少量的1-丁烯和順-2-丁烯
</p>
<p><br></p>
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## 命名

由於雙鍵在第二個碳原子上，因此為 2 - 丁烯。然中間的雙鍵無法旋轉，兩邊的甲基和氫原子互在反位，因而得名。 
英文名稱為 **trans-2-Butene**(反 - 2 - 丁烯)

## 結構

* 

## 取得

由第二丁基氯之去鹵化氫反應形成**反 - 2 - 丁烯**，副產物為氯離子和水分子 
 $\ C_{4}H_{9}Cl+OH^{-}\to C_{4}H_{8}+Cl^{-}+H_{2}O$ 
此反應仍會產生少量的 1 - 丁烯和順 - 2 - 丁烯
107-01-7