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Related Concept Videos

Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions
11:44

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions

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Asymmetric catalysis using self-assembled chiral bidentate P,P-ligands.

James M Takacs1, D Sahadeva Reddy, Shin A Moteki

  • 1Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, USA. jtakacs1@unl.edu

Journal of the American Chemical Society
|April 9, 2004
PubMed
Summary

This study presents a modular catalyst design using metal-directed self-assembly. This method efficiently creates chiral diphosphite ligands for high-yield asymmetric catalysis, achieving up to 97% enantiomeric excess.

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Area of Science:

  • Coordination Chemistry
  • Catalysis
  • Organic Synthesis

Background:

  • Modular catalyst development is crucial for efficient chemical synthesis.
  • Metal-directed self-assembly offers a precise method for constructing complex molecular architectures.
  • Heteroleptic complexes with tailored catalytic sites are highly sought after.

Purpose of the Study:

  • To develop a modular strategy for catalyst construction using metal-directed self-assembly.
  • To synthesize a library of chiral diphosphite ligands.
  • To evaluate the efficacy of these catalysts in asymmetric allylic amination.

Main Methods:

  • Metal-directed self-assembly of bifunctional subunits around a structural metal.
  • Formation of heteroleptic complexes with a second metal-binding site.
  • Preparation of a library of chiral diphosphite ligands.
  • Application in asymmetric allylic amination reactions.

Main Results:

  • Successful construction of heteroleptic complexes via self-assembly.
  • Generation of a diverse library of chiral diphosphite ligands.
  • Achieved high enantiomeric excesses (up to 97%) in asymmetric allylic amination.
  • Demonstrated the modularity and efficiency of the developed strategy.

Conclusions:

  • The described strategy enables modular catalyst development through metal-directed self-assembly.
  • Chiral diphosphite ligands synthesized via this method are effective in asymmetric catalysis.
  • This approach provides a versatile platform for designing novel catalytic systems.