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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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Historical perspective
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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Renewable Reagent for Nucleophilic Fluorination.

Blaž Alič1, Jan Petrovčič2, Jan Jelen1

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This study introduces a stable and easy-to-prepare fluoride reagent, [IPrH][F(HF)2], for efficient organic fluorination. It overcomes common challenges with nucleophilic fluoride sources, enabling broad substrate scope and convenient regeneration.

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Area of Science:

  • Organic Chemistry
  • Fluorination Chemistry

Background:

  • Nucleophilic fluoride reagents often suffer from poor solubility, hygroscopicity, and instability.
  • Existing methods for organic fluorination can be laborious and lack selectivity.

Purpose of the Study:

  • To develop a stable, soluble, and easy-to-handle nucleophilic fluoride reagent.
  • To investigate the reactivity and scope of novel imidazolium-based fluoride reagents for organic synthesis.

Main Methods:

  • Synthesis and characterization of three 1,3-diarylimidazolium-based fluoride reagents: [IPrH][F(HF)n] (n=0, 1, 2).
  • Evaluation of reagent selectivity and reactivity in the fluorination of 4-tert-butylbenzyl bromide.
  • Optimization of fluorination conditions using microwave-assisted activation and additives like DIPEA or alkali metal fluorides.
  • Testing the reagent's efficacy on a diverse range of organic substrates.

Main Results:

  • The trifluoride reagent, [IPrH][F(HF)2], demonstrated superior selectivity in fluorination reactions.
  • Microwave irradiation and additives significantly enhanced the reaction rate.
  • [IPrH][F(HF)2] successfully fluorinated various substrates including benzyl halides, aliphatic halides, tosylates, α-haloketones, silyl chloride, acyl chlorides, sulfuryl chlorides, and a nitroarene.
  • The reagent is air-stable, nonhygroscopic, and can be conveniently synthesized and regenerated.

Conclusions:

  • [IPrH][F(HF)2] is a highly effective, stable, and versatile reagent for nucleophilic fluorination.
  • The developed reagent overcomes limitations of traditional fluoride sources, offering a practical solution for organic synthesis.
  • Convenient synthesis and regeneration protocols make [IPrH][F(HF)2] an attractive option for widespread use in fluorination chemistry.