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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.9K
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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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.
3.1K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

11.5K
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.
11.5K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.4K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

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Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
3.1K
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

2.6K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.6K

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Updated: Nov 24, 2025

Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Modular functionalization and hydrogel formation via red-shifted and self-reporting [2+2] cycloadditions.

Simon Ludwanowski1, Daniel Hoenders2, Kubra Kalayci3

  • 1Institute for Macromolecular Chemistry, University of Freiburg, Stefan-Meier-Straße 31, 79104 Freiburg, Germany. simon.ludwanowski@makro.uni-freiburg.de andreas.walther@uni-mainz.de and Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Straße 21, 79104 Freiburg, Germany and Freiburg Center for Interactive Materials and Bioinspired Technologies (FIT), University of Freiburg, Georges-Köhler-Allee 105, 79110 Freiburg, Germany and Cluster of Excellence livMatS @ FIT - Freiburg Center for Interactive Materials and Bioinspired Technologies, University of Freiburg, Georges-Köhler-Allee 105, D-79110 Freiburg, Germany.

Chemical Communications (Cambridge, England)
|December 28, 2020
PubMed
Summary

We developed qStyPy, a novel photodynamic crosslinker. This red-shifted molecule enables covalent crosslinking and self-reporting via fluorescence, making it ideal for biomedical applications.

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Area of Science:

  • Photochemistry
  • Polymer Science
  • Biomedical Engineering

Background:

  • Photodynamic covalent crosslinkers are crucial for advanced material development.
  • Existing crosslinkers often lack efficient reporting mechanisms or optimal water solubility.

Purpose of the Study:

  • To introduce qStyPy, a novel modular photodynamic covalent crosslinker.
  • To demonstrate its utility in aqueous environments for biomedical applications.

Main Methods:

  • Design and synthesis of qStyPy with a permanent charge for hydrophilicity.
  • Utilizing [2+2] cycloaddition reactions triggered by 470 nm light irradiation.
  • Characterization of red-shifted fluorescence emission for self-reporting.

Main Results:

  • qStyPy efficiently forms covalent crosslinks via [2+2] cycloaddition in water.
  • The crosslinker exhibits broad emission in the far-red/near-infrared spectrum.
  • The fluorescence serves as a direct readout for cycloadduct formation.

Conclusions:

  • qStyPy is a versatile, water-soluble photodynamic crosslinker.
  • Its self-reporting capability and red-shifted emission are advantageous for biomedical research.
  • The modular design allows for broad applicability in various scientific fields.