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Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

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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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The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...

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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...

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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives

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Published on: January 19, 2016

Synthetic Methods for Four-Membered Carbocycles Bearing Emerging Fluorinated Motifs.

Hikaru Yanai¹, Shoki Hoshikawa², Kentaro Kawai²

¹School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan.

Chemistry, an Asian Journal

|November 8, 2025

Summary

This review explores synthetic methods for creating fluorinated four-membered carbocycles. These compounds combine unique cyclobutane structures with fluorine for potential drug design applications.

Keywords:

cyclization cycloaddition fluorine small ring systems synthetic methods

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Last Updated: Jan 6, 2026

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Published on: April 19, 2019

Area of Science:

Organic Chemistry
Medicinal Chemistry
Fluorine Chemistry

Background:

Four-membered carbocycles (cyclobutanes, cyclobutenes) possess unique conformational properties valuable in drug design.
Fluorine and fluorinated groups are crucial for developing biologically active molecules.
Combining these structural features offers a promising strategy for novel therapeutics.

Purpose of the Study:

To review synthetic methodologies for constructing four-membered carbocycles.
To highlight the incorporation of emerging fluorine-containing substituents, such as fluoroalkyl and sulfur-linked fluorinated groups.

Main Methods:

Focus on synthetic routes for cyclobutanes and cyclobutenes.
Discussion of methods for introducing fluoroalkyl substituents.
Exploration of techniques for attaching sulfur-linked fluorinated functionalities.

Main Results:

Overview of diverse synthetic strategies for fluorinated four-membered carbocycles.
Identification of key methods for specific fluorinated group incorporation.
Synthesis of novel fluorinated cyclobutane and cyclobutene derivatives.

Conclusions:

The synthesis of fluorinated four-membered carbocycles is an active and promising area.
These compounds hold potential for advancing drug discovery and development.
Further research into synthetic methods will enable broader applications.