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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.
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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–Addition

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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: Friedel–Crafts Acylation of Benzene01:11

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The Friedel–Crafts acylation reactions involve the addition of an acyl group to an aromatic ring. These reactions proceed via electrophilic aromatic substitution by employing an acyl chloride and a Lewis acid catalyst such as aluminum chloride to form aryl ketone.
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Friedel–Crafts reactions were developed in 1877 by the French chemist Charles Friedel and the American chemist James Crafts. Friedel–Crafts alkylation refers to the replacement of an aromatic proton with an alkyl group via electrophilic aromatic substitution. A Lewis acid catalyst such as aluminum chloride reacts with an alkyl halide to form a carbocation. The resulting carbocation then reacts with the aromatic ring and undergoes a series of electron rearrangements before giving the final...
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Gold-Catalyzed C-H Functionalization with Aryl Germanes.

Christoph Fricke1, Amit Dahiya1, William B Reid1

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Researchers developed a new gold-catalyzed method for orthogonal C-C coupling using aryl germanes. This highly efficient reaction offers a mild and robust alternative to traditional palladium catalysis for creating complex biaryl structures.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Organometallic Chemistry

Background:

  • Palladium catalysis is widely used for C-C coupling, but new orthogonal methods are needed for complex molecule synthesis.
  • Aryl germanes are generally considered unreactive in homogeneous catalysis, limiting their synthetic utility.
  • Developing selective transformations for functional group incorporation is crucial for constructing densely functionalized biaryl motifs.

Purpose of the Study:

  • To develop a novel, highly efficient, and orthogonal Csp-Csp coupling reaction.
  • To explore the reactivity of aryl germanes in homogeneous catalysis under gold catalysis.
  • To establish a mild, robust, and modular method for synthesizing functionalized biaryl compounds.

Main Methods:

  • Gold-catalyzed coupling of aryl germanes with arenes.
  • Investigation of reaction conditions for mildness and robustness.
  • Mechanistic studies involving Au(I) and Au(III) species.
  • Computational analysis of reaction energetics and transition states.

Main Results:

  • Demonstrated highly efficient and orthogonal reactivity of aryl germanes with arenes under gold catalysis.
  • Established a mild reaction protocol using an air- and moisture-stable gold catalyst.
  • Mechanistic studies confirmed high reactivity with both Au(I) and Au(III) species.
  • Computational data indicated low bond dissociation and distortion energies contribute to reactivity.

Conclusions:

  • Aryl germanes can be effectively employed in gold-catalyzed C-C coupling reactions, offering an orthogonal alternative to palladium catalysis.
  • The developed method provides a mild, robust, and modular approach for synthesizing functionalized biaryl compounds.
  • The unique reactivity of aryl germanes stems from favorable energetic factors in the catalytic cycle.