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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: Elimination–Addition01:11

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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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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.
7.4K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

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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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Diazonium Group Substitution: –OH and –H01:19

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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

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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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Exploring the Azabenzannulation of Benzothioxanthene Imide.

Arthur H G David1,2, Darío Puchán Sánchez1, Ahmad Kassem1

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The Journal of Organic Chemistry
|October 6, 2025
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Summary
This summary is machine-generated.

Researchers synthesized novel azabenzannulated benzothioxanthene imides (BTIs) using visible-light photocyclization. These functional materials exhibit fluorescence, dual redox properties, and efficient singlet oxygen generation for optoelectronics and photodynamic therapy.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Benzothioxanthene imides (BTIs) are polycyclic aromatic hydrocarbons with potential applications.
  • Developing efficient synthetic routes for functionalized BTIs is crucial for materials innovation.

Purpose of the Study:

  • To synthesize and characterize a new class of azabenzannulated benzothioxanthene imides (BTIs).
  • To explore their photophysical and redox properties for advanced applications.

Main Methods:

  • Visible-light-mediated photocyclization of imines formed in situ.
  • Condensation of amine moieties with aldehydes followed by oxidative rearomatization.
  • Characterization of photophysical properties including fluorescence quantum yields and singlet oxygen sensitization efficiencies.

Main Results:

  • Successful synthesis of novel BTIs functionalized with diverse aromatic units.
  • Achieved green-yellow fluorescence with quantum yields (φf) of 0.14-0.20.
  • Demonstrated dual redox properties, significant triplet state generation, and notable singlet oxygen sensitization efficiencies (φΔ) of 0.39-0.49.

Conclusions:

  • A straightforward and efficient synthetic strategy for BTIs was established.
  • The developed BTIs are versatile functional materials with tunable properties.
  • These materials hold significant potential for optoelectronics, biophotonics, and photodynamic therapy.