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Related Concept Videos

Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.1K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.1K
Radical Formation: Addition00:47

Radical Formation: Addition

1.7K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
1.7K
Radical Formation: Overview01:03

Radical Formation: Overview

2.1K
A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
2.1K
Radical Substitution: Allylic Bromination01:27

Radical Substitution: Allylic Bromination

5.0K
In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...
5.0K
Radical Formation: Elimination00:51

Radical Formation: Elimination

1.7K
Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions...
1.7K
Radical Anti-Markovnikov Addition to Alkenes: Mechanism01:17

Radical Anti-Markovnikov Addition to Alkenes: Mechanism

3.7K
The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
The mechanism starts with chain initiation, which involves two steps. In the first chain initiation step, a weak peroxide bond is homolytically cleaved upon mild heating to form two alkoxy radicals. In the second initiation step, a hydrogen atom is abstracted by the alkoxy...
3.7K

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Mechanochemical Radical Transformations in Organic Synthesis.

Sahra Sheikhaleslami1, Jonathan Sperry1

  • 1Centre for Green Chemical Science, School of Chemical Sciences, University of Auckland, New Zealand.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 22, 2024
PubMed
Summary

Mechanochemical radical reactions, combining solid-state synthesis and radical chemistry, offer greener and more efficient pathways for creating complex molecules. This approach expands the possibilities in organic synthesis beyond traditional solution-phase methods.

Keywords:
MechanochemistryMechanoradicalsRadical reactionsSolid-state reactionsSustainable chemistry

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Area of Science:

  • Organic Chemistry
  • Green Chemistry
  • Mechanochemistry

Background:

  • Traditional organic synthesis primarily uses solution-phase, polar transformations.
  • Recent advances in radical chemistry and mechanochemistry are shifting synthetic paradigms.
  • Current mechanochemical advances predominantly involve polar transformations, while radical chemistry advances are mainly solution-phase.

Purpose of the Study:

  • To discuss the emerging field of mechanochemical radical reactions in organic synthesis.
  • To highlight the advantages of solid-state radical reactions over traditional methods.
  • To review the progress and future potential of mechanochemical radical reactions for sustainable synthesis.

Main Methods:

  • Exploration of mechanochemical techniques for generating and reacting radical intermediates in the solid state.
  • Review of existing literature on mechanochemical radical reactions in small molecule synthesis.
  • Analysis of reaction outcomes, green chemistry metrics, and accessibility of products.

Main Results:

  • Solid-state radical reactions provide improved green chemistry metrics compared to solution-phase methods.
  • These reactions offer enhanced reaction outcomes and access to unique chemical intermediates and products.
  • Mechanochemical radical reactions are a rapidly advancing area with significant synthetic utility.

Conclusions:

  • Mechanochemical radical reactions represent a significant advancement in sustainable organic synthesis.
  • This approach offers a powerful alternative to conventional solution-phase synthesis.
  • Solid-state radical reactions are poised to play a crucial role in the future of chemical synthesis.