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Related Concept Videos

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

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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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

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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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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

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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.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
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Halogens03:01

Halogens

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Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
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Fluorinated Pyrazoles: From Synthesis to Applications.

Pavel K Mykhailiuk1,2

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Fluorinated pyrazoles are increasingly vital in drug discovery and chemistry. This review details new synthesis methods and explores the reasons behind their growing importance.

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Area of Science:

  • Medicinal chemistry
  • Drug discovery
  • Agrochemistry
  • Coordination chemistry
  • Organometallic chemistry

Background:

  • Fluorinated pyrazoles have seen exponential growth in popularity since the early 1990s.
  • Over 50% of research on fluorinated pyrazoles has been published in the last five years.
  • These compounds are crucial in various scientific fields.

Purpose of the Study:

  • To review novel synthetic approaches to fluorinated pyrazoles.
  • To provide a detailed analysis of reaction mechanisms for these syntheses.
  • To discuss the factors driving the increasing popularity of fluorinated pyrazoles.

Main Methods:

  • Literature review of recent publications on fluorinated pyrazoles.
  • Analysis of synthetic methodologies and reaction pathways.
  • Discussion of the applications and significance of fluorinated pyrazoles.

Main Results:

  • Identification and analysis of novel synthetic routes for fluorinated pyrazoles.
  • Detailed examination of reaction mechanisms involved in the synthesis.
  • Discussion of the broad applicability and reasons for the rising interest in these compounds.

Conclusions:

  • Fluorinated pyrazoles are a rapidly expanding area of research with significant implications.
  • Understanding novel synthetic methods and mechanisms is key to their continued development.
  • Emerging classes of fluorinated pyrazoles offer promising future research directions.