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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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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
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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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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...

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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.

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Nitrosoarenes as Versatile Precursors for ¹⁸F‑Fluorination.

Markus Laube¹, Silvia Roscales², Jens Pietzsch^1,3

¹Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany.

|June 15, 2026

Summary

This study introduces a new radiofluorination method using [¹⁸F]-fluoro-for-nitroso exchange. This novel approach provides versatile access to fluorine-18 labeling precursors from aromatic amines and nitroarenes.

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Microwave-assisted One-pot Synthesis of N-succinimidyl-4-[18F]fluorobenzoate ([18F]SFB)

Microwave-assisted One-pot Synthesis of N-succinimidyl-4-[¹⁸F]fluorobenzoate ([¹⁸F]SFB)

Published on: June 28, 2011

Area of Science:

Radiochemistry
Nuclear Medicine
Organic Synthesis

Background:

Fluorine-18 is a key radionuclide for positron-emission tomography (PET).
Existing radiofluorination methods have limitations in precursor accessibility and reaction scope.
The [¹⁸F]-fluoro-for-nitroso exchange has not been previously explored for radiolabeling.

Purpose of the Study:

To investigate the novel [¹⁸F]-fluoro-for-nitroso exchange reaction for radiofluorination.
To determine the substrate scope and utility of this new radiofluorination technique.
To establish a versatile method for introducing fluorine-18 into molecules derived from common aromatic precursors.

Main Methods:

Evaluation of 25 model nitrosoarene compounds.
Exploration of the [¹⁸F]-fluoro-for-nitroso exchange reaction mechanism and conditions.
Synthesis of radiolabeled compounds using the developed method.

Main Results:

Demonstrated the feasibility of the [¹⁸F]-fluoro-for-nitroso exchange for radiofluorination.
Established the substrate scope, identifying suitable nitrosoarene precursors.
Showcased the direct link between common functional groups (anilines, nitroarenes) and ¹⁸F labeling.

Conclusions:

The [¹⁸F]-fluoro-for-nitroso exchange represents a new and valuable method for radiolabeling.
This approach offers versatile access to ¹⁸F-labeled precursors from readily available aromatic amines and nitroarenes.
The findings open new avenues for developing novel PET imaging agents.