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Related Concept Videos

[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.
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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.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Redox Reactions01:24

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
Complexation Equilibria: The Chelate Effect01:19

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...

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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
10:39

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Published on: August 23, 2018

Redox-controlled selective docking in a [2]catenane host.

Gokhan Barin1, Marco Frasconi, Scott M Dyar

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.

Journal of the American Chemical Society
|January 29, 2013
PubMed
Summary
This summary is machine-generated.

This study shows a dynamic [2]catenane host can selectively bind neutral and charged guests in different pockets by changing its redox state. This redox manipulation alters binding affinity and host geometry for guest accommodation.

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Area of Science:

  • Supramolecular chemistry
  • Host-guest chemistry
  • Materials science

Background:

  • Dynamic [2]catenane hosts offer unique structural flexibility.
  • Redox manipulation is a promising strategy for controlling host-guest interactions.

Purpose of the Study:

  • To demonstrate selective guest binding in a dynamic [2]catenane host.
  • To investigate the effect of redox chemistry on host geometry and guest affinity.
  • To characterize the binding interactions in the solid state.

Main Methods:

  • Synthesis of a dynamic [2]catenane host.
  • Redox manipulation of the host.
  • X-ray crystallography for structural analysis.
  • Binding studies with neutral and charged guests.

Main Results:

  • Selective docking of neutral and charged guests into two distinct binding pockets.
  • Redox-induced changes in host geometry and guest binding affinity.
  • Stabilization of a methyl viologen dication by a bipyridinium radical cation within the host, overcoming Coulombic repulsion.

Conclusions:

  • The dynamic [2]catenane host exhibits tunable binding properties through redox control.
  • The host's geometry adapts to accommodate different guests.
  • Unique stabilization of guests with opposing charges is achieved, highlighting the host's sophisticated binding capabilities.