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Related Concept Videos

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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In an electrophilic aromatic substitution reaction, an electrophile substitutes for a hydrogen of an aromatic compound.
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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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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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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
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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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Ester dance reaction on the aromatic ring.

Kaoru Matsushita1, Ryosuke Takise1, Kei Muto1

  • 1Department of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan.

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Scientists developed a new "ester dance" reaction for aromatic systems. This palladium-catalyzed process predictably shifts ester groups to adjacent carbons, creating valuable regioisomeric products for further chemical transformations.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Aromatic rearrangement reactions enable the synthesis of complex substitution patterns in organic molecules.
  • Precise functional group translocation on aromatic rings is challenging, with the notable exception of halogen dance reactions.

Purpose of the Study:

  • To introduce and demonstrate a novel 'ester dance' reaction for predictable ester group migration on aromatic systems.
  • To explore the utility of this reaction in generating thermodynamically favored regioisomeric products.

Main Methods:

  • Development of a palladium-catalyzed reaction for the translocation of phenyl carboxylate substituents on (hetero)aromatic rings.
  • Investigation of reaction conditions to optimize regioselectivity and conversion rates.

Main Results:

  • Demonstration of an unprecedented 'ester dance' reaction, achieving predictable migration of ester groups to adjacent carbon atoms.
  • Successful synthesis of regioisomeric products with modest to good conversions, often favoring thermodynamically stable isomers.
  • The ester moiety generated can be readily transformed into diverse aromatic derivatives via amidation, acylation, and decarbonylative couplings.

Conclusions:

  • The 'ester dance' reaction provides a powerful new tool for regioselective functionalization of aromatic compounds.
  • This methodology expands the synthetic utility of esters in constructing complex aromatic architectures.