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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.

Preparation and Reactions of Thiols

Preparation and Reactions of Thiols

Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.

Preparation and Reactions of Sulfides

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

Preparation of Nitriles

Preparation of Nitriles

One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...

Electrophilic Aromatic Substitution: Nitration of Benzene

Electrophilic Aromatic Substitution: Nitration of Benzene

The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.

ortho–para-Directing Activators: –CH3, –OH, –&NoBreak;NH2, –OCH3

ortho–para-Directing Activators: –CH₃, –OH, –⁠NH₂, –OCH₃

All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...

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Updated: Jun 1, 2026

Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

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Published on: September 12, 2018

2-Iodo-5-nitro-thio-phene.

Xing Yan Xu¹, Gang Huang, Xiang Chao Zeng

¹Department of Chemistry, Jinan University, Guangzhou, Guangdong 510632, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This summary is machine-generated.

Researchers synthesized a novel nitro-iodo-thiophene derivative. Crystal structure analysis revealed a nearly planar molecule with weak intermolecular iodine-oxygen interactions forming chains.

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Area of Science:

Organic Chemistry
Crystallography

Background:

Thiophene derivatives are important in materials science and medicinal chemistry.
Understanding the structural and electronic properties of substituted thiophenes is crucial for designing new functional molecules.

Purpose of the Study:

To synthesize and characterize a novel nitro-iodo-thiophene compound.
To elucidate the molecular and crystal structure of the synthesized compound.

Main Methods:

Synthesis via nitration of iodo-thiophene using acetyl nitrate.
X-ray diffraction analysis to determine the crystal structure.

Main Results:

The compound C(4)H(2)INO(2)S was successfully synthesized.
The molecule exhibits a nearly planar structure with minor deviations in the nitro group and iodine atom positions.
Adjacent molecules form chains through weak intermolecular iodine-oxygen interactions (3.039 Å).

Conclusions:

The study provides detailed structural insights into a new nitro-iodo-thiophene derivative.
The observed intermolecular interactions influence the solid-state packing and could affect material properties.