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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

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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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Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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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.
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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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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.
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Cyclodextrin-based size-complementary [3]rotaxanes: selective synthesis and specific dissociation.

Yosuke Akae1, Yasuhito Koyama, Shigeki Kuwata

  • 1Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552 (Japan), Fax: (+81) 3-5734-2888.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 30, 2014
PubMed
Summary
This summary is machine-generated.

Researchers synthesized alpha-cyclodextrin ([small alpha]-CD) based [3]rotaxanes in water. These rotaxanes can controllably dissociate into components or [2]rotaxanes, with up to 94% yield of [2]rotaxane formation.

Keywords:
cyclodextrinrotaxanesize-complementary groupssupramolecular chemistrythermodynamics

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science

Background:

  • Cyclodextrins ([CD]s) are key macrocyclic hosts in supramolecular chemistry.
  • Rotaxanes, mechanically interlocked molecules, offer unique structural and functional properties.
  • Controlling the assembly and disassembly of rotaxanes is crucial for their applications.

Purpose of the Study:

  • To synthesize novel alpha-cyclodextrin ([small alpha]-CD)-based size-complementary [3]rotaxanes.
  • To investigate the thermal degradation pathways and products of these [3]rotaxanes.
  • To understand the factors influencing the dissociation and stabilization of rotaxane components.

Main Methods:

  • One-pot synthesis via end-capping reactions with aryl isocyanates in aqueous media.
  • X-ray structural analysis to confirm [3]rotaxane formation and regularity.
  • Thermal degradation studies and kinetic analysis of deslippage.
  • Thermodynamic studies and Nuclear Overhauser Effect Spectroscopy (NOESY) for structural insights.

Main Results:

  • Selective formation of head-to-head [3]rotaxanes was achieved.
  • Thermal degradation yielded original components and [2]rotaxanes, with up to 94% [2]rotaxane yield.
  • [2]rotaxanes were found to be significantly stabilized.
  • Dissociation of [3]rotaxanes is tunable via end-group structure, CD orientation, and axle length.

Conclusions:

  • The study demonstrates a facile method for preparing tunable [3]rotaxanes in water.
  • Controlled dissociation into [2]rotaxanes is a key characteristic, with potential for responsive materials.
  • Structural modifications offer precise control over rotaxane stability and disassembly behavior.