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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.4K
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

4.2K
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.
4.2K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.6K
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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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

12.1K
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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Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

9.7K
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...
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Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control01:23

Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control

3.6K
The addition of a hydrogen halide to 1,3-butadiene gives a mixture of 1,2- and 1,4-adducts. Since more substituted alkenes are more stable, the 1,4-adduct is expected to be the major product. However, the product distribution is strongly influenced by temperature; low temperature favors the 1,2-adduct, whereas the 1,4-adduct is predominant at high temperature.
3.6K

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Recent developments in high-pressure promoted cycloaddition reactions: experimental and theoretical perspectives.

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High-pressure conditions enhance cycloaddition reactions, overcoming steric and electronic limitations common in synthetic chemistry. This approach offers a greener alternative to traditional catalysis, improving reaction efficiency and sustainability.

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Area of Science:

  • Organic Chemistry
  • Physical Chemistry

Background:

  • Cycloaddition reactions are essential synthetic tools but often face limitations due to steric and electronic factors.
  • Traditional methods may require harsh chemical catalysts, impacting reaction efficiency and sustainability.

Purpose of the Study:

  • To review recent advancements in high-pressure-mediated cycloadditions.
  • To highlight the benefits of high-pressure techniques in overcoming synthetic challenges.
  • To emphasize the contribution of high-pressure chemistry to sustainable synthesis.

Main Methods:

  • Review of experimental studies utilizing high-pressure conditions for cycloadditions.
  • Analysis of theoretical investigations into high-pressure effects on cycloaddition mechanisms.
  • Compilation of case studies demonstrating enhanced reaction outcomes under pressure.

Main Results:

  • High-pressure conditions effectively promote challenging cycloadditions, reducing or eliminating the need for catalysts.
  • Pressure significantly influences reaction rates and selectivities in various cycloaddition types.
  • Experimental and theoretical data consistently support the utility of high pressure.

Conclusions:

  • High-pressure cycloadditions represent a powerful strategy for efficient and sustainable organic synthesis.
  • This methodology provides a viable alternative to conventional catalytic approaches.
  • Further exploration of high-pressure techniques promises to expand the scope of green chemistry.