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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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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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¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Benzene is the simplest aromatic hydrocarbon or arene. The IUPAC names for simple monosubstituted benzene derivatives are derived by adding the substituent's name as a prefix to the parent benzene. For example, halobenzene, where the halogen could be fluoro (F), chloro (Cl), bromo (Br), and iodo (I).
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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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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...
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Double heteroatom functionalization of arenes using benzyne three-component coupling.

José-Antonio García-López1, Meliha Çetin, Michael F Greaney

  • 1School of Chemistry, University of Manchester, Oxford Rd, Manchester, M13 9PL (UK).

Angewandte Chemie (International Ed. in English)
|January 13, 2015
PubMed
Summary

This study introduces a new method for synthesizing difunctionalized arenes using arynes and nucleophilic components. The reaction efficiently creates complex molecules with heteroatom functionalities in a single step.

Keywords:
Grignard reactionarynesbenzyneheterocyclesmulticomponent reactions

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Arynes are highly reactive intermediates crucial in organic synthesis.
  • Developing efficient methods for functionalizing arenes is a key area of research.

Purpose of the Study:

  • To develop a novel three-component coupling reaction for synthesizing 1,2-heteroatom-difunctionalized arenes.
  • To utilize 2-iodophenyl arylsulfonates as effective benzyne precursors.

Main Methods:

  • Employing three-component coupling reactions involving arynes, N, S, Se, and P functionalities.
  • Utilizing 2-iodophenyl arylsulfonates to generate benzyne intermediates.
  • Reacting magnesiated nucleophiles with the benzyne triple bond, followed by trapping with electrophilic reagents in the presence of a copper(I) catalyst.

Main Results:

  • Successfully achieved the addition of magnesiated S-, Se-, and N-nucleophilic components to the benzyne triple bond.
  • Generated a variety of 1,2-difunctionalized arenes through a one-pot procedure.
  • Demonstrated the versatility of the method with different heteroatom functionalities.

Conclusions:

  • The developed method provides an efficient route to 1,2-heteroatom-difunctionalized arenes.
  • This approach offers a valuable tool for constructing complex organic molecules with precise functionalization.