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Related Concept Videos

Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

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 confirmed through isotopic...
Amines to Alkenes: Hofmann Elimination01:16

Amines to Alkenes: Hofmann Elimination

Alkenes can be obtained from amines via an E2 elimination. The amine is first converted into a good leaving group, such as a quaternary ammonium salt. This is accomplished by treating the amine with an excess of alkyl halide, which results in a halide salt. Next, the halide salt is transformed into a hydroxide salt that functions as a base to enable elimination.
Under thermal conditions, the hydroxide can abstract a proton from the β carbon; this generates an alkene with the simultaneous...
Preparation of Amines: Reduction of Amides and Nitriles01:13

Preparation of Amines: Reduction of Amides and Nitriles

Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
Amines to Alkenes: Cope Elimination01:14

Amines to Alkenes: Cope Elimination

Cope elimination reaction involves the conversion of tertiary amines to alkene using hydrogen peroxide under thermal conditions, as depicted in figure 1.
Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.

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Related Experiment Video

Updated: Jun 10, 2026

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
19:58

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

Published on: July 30, 2017

Slow reductive elimination from arylpalladium parent amido complexes.

Jessica L Klinkenberg1, John F Hartwig

  • 1Department of Chemistry, University of Illinois, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.

Journal of the American Chemical Society
|August 11, 2010
PubMed
Summary

This study reveals that palladium complexes with specific bulky ligands facilitate reductive elimination of primary arylamines, challenging previous trends in organometallic chemistry and catalysis.

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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

Published on: May 28, 2014

Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Organic Synthesis

Background:

  • Reductive elimination is a key step in many catalytic cycles, but its efficiency is influenced by ligand and substrate properties.
  • Palladium complexes are widely used catalysts in cross-coupling reactions, including C-N bond formation.

Purpose of the Study:

  • To investigate the reductive elimination of primary arylamines from arylpalladium(II) parent amido complexes.
  • To understand the influence of bisphosphine ligands on the formation, stability, and reactivity of these complexes.

Main Methods:

  • Synthesis and characterization of bisphosphine-ligated arylpalladium(II) parent amido complexes.
  • Kinetic studies of reductive elimination reactions.
  • Computational studies (e.g., DFT) to elucidate reaction mechanisms and steric effects.

Main Results:

  • Arylpalladium parent amido complexes ligated by alkylbisphosphine CyPF-t-Bu form and undergo reductive elimination, unlike those with aromatic bisphosphines (DPPF, BINAP).
  • CyPF-t-Bu-ligated complexes exhibit slower reductive elimination rates compared to arylamido or alkylamido analogues, despite the parent amido ligand's basicity.
  • Parent amido complexes show faster formation and greater thermodynamic stability than arylamido complexes.
  • Steric effects, as supported by computational studies, play a dominant role in the stability and reactivity of these complexes.

Conclusions:

  • The bulky alkylbisphosphine ligand CyPF-t-Bu stabilizes the arylpalladium amido complex, making it the resting state in aryl halide coupling with ammonia.
  • This finding contrasts with typical palladium-catalyzed amination reactions where Pd(0) or arylpalladium(II) species are often the resting states.
  • The steric influence of ligands is crucial for controlling reactivity in palladium-catalyzed amination reactions.