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

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

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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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Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

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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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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

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One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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Acid-Catalyzed α-Halogenation of Aldehydes and Ketones01:21

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones

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By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
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Palladium-catalyzed interannular meta-C-H arylation.

Peng-Xiang Ling1, Kai Chen2, Bing-Feng Shi1

  • 1Department of Chemistry, Zhejiang University, Hangzhou 310027, China. bfshi@zju.edu.cn.

Chemical Communications (Cambridge, England)
|February 2, 2017
PubMed
Summary

This study introduces a new palladium-catalyzed method for C-H arylation of biaryl compounds. The trifluoroacetyl group is key for achieving selective reactions, enabling diverse biaryl-2-amine synthesis.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Biaryl compounds are crucial structural motifs in pharmaceuticals and materials.
  • Developing selective C-H functionalization methods is a key challenge in organic synthesis.
  • Palladium catalysis offers powerful tools for C-H activation and cross-coupling reactions.

Purpose of the Study:

  • To report a novel interannular meta-selective C-H arylation of biaryl-2-trifluoroacetamides.
  • To investigate the role of the trifluoroacetyl group in directing selectivity.
  • To establish a versatile synthetic route to functionalized biaryl-2-amine derivatives.

Main Methods:

  • Utilizing a palladium(II)/norbornene catalytic system.
  • Employing biaryl-2-trifluoroacetamides as substrates.
  • Isolation and characterization of a dimeric palladacycle intermediate.

Main Results:

  • Achieved interannular meta-selective C-H arylation.
  • Demonstrated the essential role of the trifluoroacetyl group for selectivity.
  • Identified a dimeric palladacycle as the key catalytic intermediate.
  • Showcased further functionalization via ipso-alkynylation and ortho-C-H functionalization.

Conclusions:

  • The developed method provides efficient access to selectively arylated biaryl compounds.
  • The trifluoroacetyl group serves as a crucial directing and activating group.
  • The methodology allows for the synthesis of diverse and complex biaryl-2-amine derivatives.