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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...
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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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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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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.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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On-surface aryl-aryl coupling via selective C-H activation.

Qiang Sun1, Chi Zhang, Huihui Kong

  • 1College of Materials Science and Engineering, Tongji University, Caoan Road 4800, Shanghai 201804, P. R. China. xuwei@tongji.edu.cn.

Chemical Communications (Cambridge, England)
|August 27, 2014
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Summary

Researchers achieved selective aryl-aryl coupling using direct C-H bond activation on copper surfaces. This method offers a new, generalizable route for creating low-dimensional carbon nanomaterials.

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Area of Science:

  • Surface Science
  • Materials Chemistry
  • Nanotechnology

Background:

  • Direct C-H bond activation is a key challenge in organic synthesis.
  • Developing efficient methods for creating low-dimensional carbon nanomaterials is crucial for advanced applications.

Purpose of the Study:

  • To demonstrate a selective aryl-aryl coupling reaction via direct C-H bond activation on a metal surface.
  • To establish a generalizable method for synthesizing low-dimensional carbon nanomaterials.

Main Methods:

  • Utilized high-resolution scanning tunneling microscopy (STM) for imaging and manipulation.
  • Employed density functional theory (DFT) calculations to understand reaction mechanisms.

Main Results:

  • Achieved unprecedented selective aryl-aryl coupling on a Cu(110) surface through direct C-H bond activation.
  • Demonstrated the feasibility of this approach for controlled nanomaterial synthesis.

Conclusions:

  • The study presents a novel and efficient method for C-H bond activation and coupling on surfaces.
  • This work provides a simple and generalized route for the preparation of low-dimensional carbon nanomaterials.