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Radical Formation: Elimination00:51

Radical Formation: Elimination

1.9K
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...
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Radical Substitution: Allylic Bromination01:27

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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...
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Radical Formation: Addition00:47

Radical Formation: Addition

1.9K
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...
1.9K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.2K
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...
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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

5.2K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.2K
Radical Formation: Overview01:03

Radical Formation: Overview

2.3K
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...
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Desulfonylation via Radical Process: Recent Developments in Organic Synthesis.

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Sulfonyl compounds are versatile "chemical chameleons" enabling novel bond formations through radical reactions. This review details advances in radical-mediated desulfonylation, offering new synthetic strategies for organic chemists.

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Area of Science:

  • Organic Chemistry
  • Radical Chemistry
  • Synthetic Methodology

Background:

  • Sulfonyl compounds exhibit high reactivity and flexibility, earning them the nickname 'chemical chameleon'.
  • Their utility in forming diverse molecular architectures is well-established.
  • The sulfonyl group's ability to act as a leaving group is key to many transformations.

Purpose of the Study:

  • To review recent advancements in radical-mediated desulfonylation reactions.
  • To highlight novel bond formation strategies complementary to traditional methods.
  • To provide insights into reaction designs, scopes, mechanisms, and limitations.

Main Methods:

  • Summarizing recent literature on radical-mediated desulfonylation.
  • Analyzing reaction designs and substrate scopes.
  • Discussing mechanistic studies and synthetic applications.

Main Results:

  • Radical transformations involving sulfonyl compounds offer new synthetic pathways.
  • Selective C-S, N-S, O-S, S-S, and Se-S bond cleavage enables functionalization.
  • These methods provide alternatives to classical two-electron cross-coupling reactions.

Conclusions:

  • Radical-mediated desulfonylation represents a powerful and expanding area in synthetic organic chemistry.
  • These transformations offer significant synthetic potential for constructing complex molecules.
  • The review serves as a valuable resource for chemists interested in radical chemistry.