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Radical Substitution: Allylic Bromination

Radical Substitution: Allylic Bromination

In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...

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...

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.

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: Fluorination and Iodination of Benzene

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.

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Elucidating the Metabolism of 2,4-Dibromophenol in Plants

Elucidating the Metabolism of 2,4-Dibromophenol in Plants

Published on: February 10, 2023

Brominated extracts as source of bioactive compounds.

Luciana Méndez¹, Mario O Salazar, I Ayelen Ramallo

¹Instituto de Química de Rosario, Universidad Nacional de Rosario and CONICET, Rosario, Argentina.

ACS Combinatorial Science

|March 15, 2011

Summary

Bromination of a crude plant extract modified its chemical and biomolecular properties, resulting in the identification of a novel acetylcholinesterase inhibitor.

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Area of Science:

Biochemistry
Medicinal Chemistry
Pharmacology

Background:

Crude plant extracts are a rich source of bioactive compounds.
Acetylcholinesterase (AChE) inhibitors are crucial for treating neurological disorders like Alzheimer's disease.
Chemical modification of natural products can enhance their therapeutic potential.

Purpose of the Study:

To investigate the effect of bromination on the chemical composition and biomolecular properties of a crude plant extract.
To discover novel acetylcholinesterase inhibitors through chemical modification.

Main Methods:

Extraction of compounds from a crude plant source.
Chemical modification of the extract via bromination.
Assay of the modified extract for acetylcholinesterase inhibitory activity.

Main Results:

Bromination significantly altered the chemical structure of the crude plant extract.
The brominated extract exhibited potent acetylcholinesterase inhibitory activity.
Identification of a novel AChE inhibitor derived from the plant extract.

Conclusions:

Chemical modification, specifically bromination, is a viable strategy for discovering new bioactive compounds.
The identified brominated compound represents a promising lead for the development of new acetylcholinesterase inhibitors.
Further research is warranted to elucidate the precise mechanism of action and optimize the inhibitor's properties.