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Related Concept Videos

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.
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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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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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[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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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

2.0K
The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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Intermolecular 2+2 imine-olefin photocycloadditions enabled by Cu(I)-alkene MLCT.

Daniel M Flores1,2, Michael L Neville1, Valerie A Schmidt3

  • 1University of California San Diego, Department of Chemistry and Biochemistry, 9500 Gilman Drive, La Jolla, CA, 92093, USA.

Nature Communications
|May 19, 2022
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Copper catalysis enables efficient 2+2 photocycloadditions between imines and alkenes, overcoming limitations of direct excitation methods. This approach provides a versatile route to synthesize substituted azetidines, valuable heterocyclic compounds.

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Catalysis

Background:

  • 2+2 photocycloadditions are key for synthesizing 4-membered heterocyclic rings like azetidines.
  • Direct excitation methods for these reactions are often limited by poor photophysical properties of reactants.

Purpose of the Study:

  • To develop a novel copper-catalyzed method for 2+2 photocycloaddition of imines and alkenes.
  • To overcome the limitations of direct excitation in synthesizing substituted azetidines.

Main Methods:

  • Utilized copper catalysis for imine-olefin photocycloaddition.
  • Employed selective alkene activation via a coordination-MLCT pathway.
  • Combined experimental and computational studies for mechanistic investigation.

Main Results:

  • Successfully synthesized a variety of substituted azetidines.
  • Demonstrated the efficacy of copper catalysis in 2+2 imine-olefin photocycloaddition.
  • Elucidated the reaction mechanism involving selective alkene activation.

Conclusions:

  • Copper catalysis offers a powerful alternative for 2+2 photocycloaddition reactions.
  • The developed method provides a new pathway for azetidine synthesis.
  • Mechanistic insights guide future catalyst design and reaction optimization.