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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 Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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

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

11.2K
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.
11.2K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.0K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
2.0K
Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

8.8K
Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
8.8K

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Green-light induced cycloadditions.

Philipp W Kamm1,2,3, James P Blinco1,2, Andreas-Neil Unterreiner3

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Researchers developed a novel red-shifted tetrazole for efficient nitrile imine-mediated tetrazole-ene cycloaddition (NITEC) reactions. This advancement enables versatile small molecule and polymer modifications using visible light, offering a new tool for chemical synthesis.

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Polymer Chemistry

Background:

  • Tetrazole-ene cycloaddition is a valuable reaction in organic synthesis.
  • Traditional methods often require harsh conditions or specific catalysts.
  • Developing light-initiated reactions offers milder and more controlled synthetic routes.

Purpose of the Study:

  • To introduce a novel red-shifted tetrazole derivative.
  • To investigate its reactivity in nitrile imine-mediated tetrazole-ene cycloaddition (NITEC) under visible light.
  • To demonstrate its utility in modifying small molecules and polymers.

Main Methods:

  • Synthesis of a novel red-shifted tetrazole.
  • Photochemical irradiation using blue and green light-emitting diodes (LEDs).
  • Detailed analysis of wavelength-dependent reactivity.
  • Application in small molecule and polymer end-group functionalization.

Main Results:

  • The red-shifted tetrazole efficiently undergoes NITEC reactions under blue and green light.
  • A comprehensive map of reactivity across different wavelengths was established.
  • High conversion rates were achieved for both small molecule and polymer modifications.
  • The method proved effective for end-group functionalization of polymers.

Conclusions:

  • The developed red-shifted tetrazole is a versatile reagent for photochemically triggered NITEC reactions.
  • Visible light irradiation provides a mild and efficient method for chemical modifications.
  • This approach offers significant potential for applications in materials science and drug discovery.