Bromination of Ethylene

C2H4 + Br2 → C2H4Br2

概要

Ethylene reacts with bromine in an electrophilic addition reaction to form 1,2-dibromoethane. The brown color of bromine water is decolorized instantly, making this the classic qualitative test for unsaturation (C=C double bonds). The mechanism involves a cyclic bromonium ion intermediate.

参加者

役割 物質 係数 状態
反応物 Ethylene C₂H₄ 1 (g)
反応物 Bromine Br 1 (l)

日常の例

The bromine water test for alkenes is one of the most dramatic color-change tests in organic chemistry: brown instantly becomes colorless.

産業上の重要性

1,2-ジブロモエタンは歴史的に有鉛ガソリンの鉛スカベンジャーとして使用されており、現在は重要な化学中間体となっています。

特性

タイプ
Organic
可逆的
いいえ
エネルギー
発熱性
ΔH
-121.0 kJ/mol

関連する反応

Epoxidation of Alkenes (mCPBA) Swern Oxidation Oxidation of Secondary Alcohol to Ketone E2 Elimination (Dehydrohalogenation) Claisen Condensation (Ethyl Acetate) Aldol Condensation of Acetaldehyde Kolbe Electrolysis Baeyer-Villiger Oxidation Beckmann Rearrangement (Cyclohexanone Oxime) Dehydration of Ethanol

Frequently Asked Questions

What is the equation for Bromination of Ethylene?
The balanced equation is: C₂H₄ + Br₂ → C₂H₄Br₂.
What type of reaction is Bromination of Ethylene?
Bromination of Ethylene is a organic reaction.
Is Bromination of Ethylene exothermic or endothermic?
Bromination of Ethylene is exothermic (releases energy). The enthalpy change (ΔH) is -121.0 kJ/mol.