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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

4.8K
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.
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Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

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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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Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

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6.0K
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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Light-Driven Access to Selenium-Substituted Thiazole-2-imine Derivatives.

Tangle Li1, Dandan Hu1, Yiwen Huang1

  • 1Advanced Research Institute and Department of Chemistry, Taizhou University, Jiaojiang 318000, China.

The Journal of Organic Chemistry
|April 10, 2024
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Researchers developed a new, greener method for synthesizing selenium-substituted thiazole-2-imine derivatives. This metal- and photoinitiator-free photocatalytic strategy offers mild conditions and high yields for diverse compounds.

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Photocatalysis

Background:

  • Thiazole-2-imine derivatives exhibit significant pharmacological activities.
  • Existing synthesis methods often involve metals, additives, or harsh conditions, limiting their practicality.

Purpose of the Study:

  • To develop a novel, efficient, and environmentally friendly synthesis for selenium-substituted thiazole-2-imine derivatives.
  • To establish a metal- and photoinitiator-free photocatalytic approach.

Main Methods:

  • Utilized a photocatalytic strategy under mild reaction conditions.
  • Employed a metal- and photoinitiator-free system.
  • Investigated the synthesis of various selenium-substituted thiazole-2-imine derivatives.

Main Results:

  • Successfully synthesized diverse selenium-substituted thiazole-2-imine derivatives.
  • Achieved good to excellent yields across 37 examples.
  • Demonstrated a broad substrate scope for the developed method.

Conclusions:

  • The new photocatalytic strategy provides an efficient and mild route to selenium-substituted thiazole-2-imine derivatives.
  • This method avoids the use of metals and photoinitiators, offering a greener alternative.
  • The approach is suitable for synthesizing a wide range of target compounds with high yields.