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[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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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

4.6K
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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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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4.1K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Diaryl Telluroxides as Reversible Recognition Arrays in Solution.

Zoe Nonie Scheller1, Noel Miszewski1, Felix Brinkmann1

  • 1Fakultät für Chemie, Universität Duisburg-Essen, Universitätsstr. 7, Essen D-45117, Germany.

Inorganic Chemistry
|October 30, 2025
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Summary
This summary is machine-generated.

This study shows that telluroxides form stable dimers in solution via Te···O interactions. This discovery enables the design of new responsive molecular architectures, like stabilized azobenzene derivatives.

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Area of Science:

  • Supramolecular chemistry
  • Organotellurium chemistry

Background:

  • Chalcogen bonding is crucial in supramolecular chemistry but limited in solution-phase applications.
  • Achieving strong binding often requires multivalent or charged systems.

Purpose of the Study:

  • To provide evidence for intermolecular Te···O interactions in diaryl telluroxides in solution.
  • To explore the application of these interactions in stabilizing molecular architectures.

Main Methods:

  • Quantum chemical calculations
  • Diffusion-ordered spectroscopy nuclear magnetic resonance (DOSY NMR)
  • Titration studies

Main Results:

  • Evidence for intermolecular Te···O interactions in diaryl telluroxides.
  • Identification of dimeric diaryl telluroxide species in solution.
  • Successful extension of the thermal cis half-life of an azobenzene derivative via intramolecular Te···O stabilization.

Conclusions:

  • Diaryl telluroxides form stable dimeric species in solution through Te···O interactions.
  • Telluroxide-based systems show potential for creating responsive molecular architectures.
  • This work expands the utility of chalcogen bonding in solution-phase supramolecular chemistry.