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Related Concept Videos

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

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Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...
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The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.
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Deoxygenative C-C Bond-Forming Processes via a Net Four-Electron Reductive Coupling.

David P Todd1, Benjamin B Thompson1, Alex J Nett1

  • 1Department of Chemistry, University of Michigan , 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States.

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|October 6, 2015
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Summary
This summary is machine-generated.

This study introduces a novel nickel-catalyzed coupling reaction that efficiently synthesizes skipped dienes from enones or enals and alkynes. The method utilizes a four-electron reductive coupling with deoxygenation, offering a traceless alkene installation strategy.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Enones and enals are versatile substrates in organic synthesis.
  • Direct coupling of carbonyl compounds with alkynes remains a challenge.
  • Developing efficient methods for skipped diene synthesis is of significant interest.

Purpose of the Study:

  • To develop a novel nickel-catalyzed coupling reaction.
  • To provide direct access to skipped diene products.
  • To enable a traceless strategy for alkene installation.

Main Methods:

  • Nickel-catalyzed coupling of enones/enals with alkynes.
  • Use of silane and titanium alkoxide reductants.
  • Development of novel nickel(0) precatalysts with N-heterocyclic carbene ligands.

Main Results:

  • Direct synthesis of skipped diene products achieved.
  • The reaction involves a net four-electron reductive coupling.
  • Deoxygenation of the starting enone or enal occurs.
  • A new class of nickel(0) precatalysts is essential for efficiency.

Conclusions:

  • The developed method provides efficient access to skipped dienes.
  • The strategy utilizes the reactivity of α,β-unsaturated carbonyls.
  • Simultaneous oxygen extrusion enables traceless alkene installation.