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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

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

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

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, or cyano...
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

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 confirmed through isotopic...
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between the...
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

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.
Directing Effect of Substituents: meta-Directing Groups01:09

Directing Effect of Substituents: meta-Directing Groups

Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the ortho, meta, and para...

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Core-substituted naphthalenediimides.

Naomi Sakai1, Jiri Mareda, Eric Vauthey

  • 1Department of Organic Chemistry, University of Geneva, Geneva, Switzerland. naomi.sakai@unige.ch

Chemical Communications (Cambridge, England)
|May 18, 2010
PubMed
Summary
This summary is machine-generated.

Core-substituted naphthalenediimides (cNDIs) exhibit tunable light absorption and fluorescence. These versatile molecules function as n-semiconductors and in artificial photosystems, demonstrating broad applications in chemistry and materials science.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Core-substituted naphthalenediimides (cNDIs) are a class of molecules with tunable electronic and optical properties.
  • Research has focused on their synthesis, photophysical behavior, and applications in various fields.

Purpose of the Study:

  • To provide a comprehensive review of the research on core-substituted naphthalenediimides (cNDIs).
  • To highlight the versatility of cNDIs in areas ranging from molecular recognition to electron transport and artificial photosynthesis.

Main Methods:

  • Review of synthesis, electrochemistry, and spectroscopy of cNDIs.
  • Analysis of supramolecular chemistry, including pi-stacks and hydrogen bonds.
  • Investigation of molecular recognition, anion transport, and electron transport properties.
  • Exploration of applications in organic field-effect transistors (OFETs) and artificial photosystems.

Main Results:

  • cNDIs with electron-donating substituents absorb and fluoresce across the color spectrum without structural changes.
  • cNDIs with electron-withdrawing substituents exhibit enhanced pi-acidity.
  • cNDIs function as air-stable n-semiconductors with high charge mobility.
  • Photoinduced electron transport in cNDIs enables applications in light harvesting, solar cells, and ion channel photosystems.

Conclusions:

  • Core-substituted naphthalenediimides are highly versatile molecules with significant potential in diverse scientific disciplines.
  • Their tunable properties allow for applications in advanced materials, sensors, and energy conversion systems.
  • The interdisciplinary nature of cNDI research bridges organic, supramolecular, and physical chemistry.