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Cope elimination reaction involves the conversion of tertiary amines to alkene using hydrogen peroxide under thermal conditions, as depicted in figure 1.
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Elimination Reactions

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A nucleophile can react with an alkyl halide to give the substitution product by displacing the halogen. Or it can function as a base to give the elimination product by deprotonation of the neighboring carbon to form an alkene. In an elimination reaction, the substrate loses two groups from adjacent carbons forming at least one π bond. The carbon attached to the halogen is called the α carbon, while the adjacent carbon is called the β carbon; hence, these reactions are called...
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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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Nitriles to Amines: LiAlH4 Reduction00:55

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Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
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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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Reductive Elimination from Sterically Encumbered Ni-Polypyridine Complexes.

Craig S Day1,2, Stephanie J Ton1, Ryan T McGuire1

  • 1The Barcelona Institute of Science and Technology, Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007 Tarragona, Spain.

Organometallics
|October 17, 2022
PubMed
Summary
This summary is machine-generated.

Sterically encumbered nickel complexes with bulky ligands facilitate easier C(sp3)-C(sp3) bond breaking. This discovery advances the understanding of nickel catalysis mechanisms.

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Coordination Chemistry

Background:

  • Nickel complexes are crucial catalysts in organic synthesis.
  • Understanding reductive elimination is key to optimizing Ni-catalyzed reactions.
  • Steric hindrance can significantly influence complex reactivity and structure.

Purpose of the Study:

  • To synthesize and characterize sterically encumbered dialkylnickel(II) complexes.
  • To investigate the structural impact of bulky ligands on nickel complexes.
  • To explore the effect of steric encumbrance on C(sp3)-C(sp3) reductive elimination.

Main Methods:

  • Synthesis of novel dialkylnickel(II) complexes with 2,9-dimethyl-1,10-phenanthroline ligands.
  • X-ray crystallography for structural analysis.
  • Theoretical calculations to compare molecular structures.
  • Eyring plots, stoichiometric, and photoexcitation studies to probe reaction mechanisms.

Main Results:

  • Sterically encumbered nickel complexes exhibit significant molecular structure distortions compared to unsubstituted analogues.
  • These complexes demonstrate facile C(sp3)-C(sp3) reductive elimination.
  • The bulky ligands play a crucial role in promoting this key catalytic step.

Conclusions:

  • Sterically encumbered dialkylnickel(II) complexes are effective for C(sp3)-C(sp3) bond activation.
  • The findings provide deeper insights into the mechanisms of nickel-catalyzed reactions.
  • This work offers potential for designing more efficient nickel catalysts.