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

Swern Oxidation Oxidation of Secondary Alcohol to Ketone Claisen Condensation (Ethyl Acetate) Kolbe Electrolysis Baeyer-Villiger Oxidation Beckmann Rearrangement (Cyclohexanone Oxime) Catalytic Hydrogenation of Ethylene Condensation Polymerization (Nylon 6,6) Cope Rearrangement Epoxidation of Alkenes (mCPBA)

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.