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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.0K
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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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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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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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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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

11.3K
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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.0K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.3K
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.
2.3K

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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
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Versatile Direct Cyclization Constructs Spiro-acridan Derivatives for Highly Efficient TADF emitters.

He Liu1, Zhiwen Liu1, Ganggang Li2

  • 1College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518055, P. R. China.

Angewandte Chemie (International Ed. in English)
|March 26, 2021
PubMed
Summary
This summary is machine-generated.

A new, cost-effective method synthesizes spiro-acridan (SpA) derivatives for efficient thermally activated delayed fluorescent (TADF) emitters. This advance enables high-performance organic light-emitting diodes (OLEDs).

Keywords:
cyclizationorganic light-emitting diodessprio-acridanthermally activated delayed fluorescence

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Spiro-acridan (SpA) derivatives are crucial for developing efficient thermally activated delayed fluorescent (TADF) emitters.
  • Current synthetic routes for SpAs are often expensive and time-consuming, hindering widespread application.

Purpose of the Study:

  • To develop a simple, cost-effective, and metal-free synthetic procedure for spiro-acridan derivatives.
  • To demonstrate the utility of these synthesized SpAs in creating high-performance TADF emitters for organic optoelectronic devices.

Main Methods:

  • An acid-catalyzed, solvent-free, metal-free cyclization reaction between diarylamines and ketones was employed to synthesize SpA moieties.
  • The synthesized spiro-acridan derivative, D2T-TR, was characterized for its photophysical properties.

Main Results:

  • A feasible and efficient synthetic route for spiro-acridan derivatives was established.
  • The D2T-TR molecule exhibited a high photoluminescent quantum yield and suitable TADF characteristics.
  • An organic light-emitting diode (OLED) utilizing D2T-TR achieved a maximum external quantum efficiency (EQE) of 27.1%.

Conclusions:

  • The developed synthetic method offers a practical approach for accessing spiro-acridan structures.
  • This work provides a promising pathway for designing advanced organic optoelectronic materials, particularly TADF emitters for efficient OLEDs.