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Halogenation of Alkenes

Halogenation of Alkenes

Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.

Prochirality

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...

Formation of Halohydrin from Alkenes

Formation of Halohydrin from Alkenes

An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.

Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene

Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene

The Friedel–Crafts acylation reactions involve the addition of an acyl group to an aromatic ring. These reactions proceed via electrophilic aromatic substitution by employing an acyl chloride and a Lewis acid catalyst such as aluminum chloride to form aryl ketone.

Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene

Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene

The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.

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Related Experiment Video

Updated: Jul 15, 2026

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

Published on: August 18, 2017

Simultaneous conversion of CHClF(2) and CH(3)Br to CH(2)CF(2).

Hai Yu¹, Eric M Kennedy, John C Mackie

¹Process Safety and Environment Protection Research Group, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia.

|May 8, 2007

Summary

This study explores the gas phase reaction between chlorodifluoromethane (CHClF2) and methyl bromide (CH3Br). It highlights the potential to convert these ozone-depleting substances into valuable tetrafluoroethylene (CH2CF2).

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Area of Science:

Chemical Engineering
Environmental Chemistry
Materials Science

Background:

Ozone-depleting substances (ODS) pose significant environmental risks.
Developing sustainable chemical synthesis routes is crucial for environmental remediation.
Tetrafluoroethylene (CH2CF2) is a valuable industrial chemical.

Purpose of the Study:

To investigate the gas phase reaction between chlorodifluoromethane (CHClF2) and methyl bromide (CH3Br).
To determine optimal conditions for producing tetrafluoroethylene (CH2CF2).
To explore the potential of converting ODS into valuable chemicals.

Main Methods:

Gas phase reaction conducted in an alumina tube reactor.
Temperature range: 773-1123 K.
Varied input molar ratios of CH3Br to CHClF2.
Analysis of major and minor reaction products using gas chromatography.

Main Results:

High yield of CH2CF2 (53%) achieved at 1123 K with a CH3Br:CHClF2 molar ratio of 1.8.
Major products identified: C2F4, CH2CF2, and CH4.
Minor products include CH3Cl, CHF3, C2H4, C2H2, CH2CFCF3, and C2H3F.
Reactions with CH3Cl and CH3I were studied to elucidate reaction mechanisms.

Conclusions:

The reaction presents a viable pathway for converting ODS (CHClF2 and CH3Br) into valuable CH2CF2.
Optimized conditions can maximize CH2CF2 yield, suggesting potential for industrial application.
Further studies on reaction chemistry can aid in process development and environmental management.