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Radical Formation: Addition00:47

Radical Formation: Addition

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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.
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Radical Reactivity: Overview01:11

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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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Radical Chain-Growth Polymerization: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Radical Reactivity: Intramolecular vs Intermolecular01:33

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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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A novel carbamoyl radical based dearomatizing spiroacylation process.

Alejandra Millán-Ortiz1, German López-Valdez, Fernando Cortez-Guzmán

  • 1Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior S. N., Ciudad Universitaria, Coyoacán México, D. F. 04510, Mexico. lmiranda@unam.mx.

Chemical Communications (Cambridge, England)
|April 18, 2015
PubMed
Summary

Researchers developed a new dearomatizing spiroacylation method for synthesizing novel spirodienonamides. This efficient process creates complex molecules with an all-carbon quaternary center, expanding synthetic chemistry capabilities.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Spirocyclic compounds are important structural motifs in natural products and pharmaceuticals.
  • Developing efficient methods for constructing spirocyclic frameworks, particularly those with all-carbon quaternary centers, remains a significant challenge in organic synthesis.

Purpose of the Study:

  • To report the first dearomatizing spiroacylation process for the synthesis of novel spirodienonamides.
  • To provide easy access to complex spirocyclic structures containing an acyl-functionalized all-carbon quaternary center.

Main Methods:

  • The study utilized carbamoylxanthates as key precursors.
  • A dearomatizing spiroacylation reaction was employed to transform these precursors.
  • The reaction conditions were optimized to achieve efficient synthesis of the target compounds.

Main Results:

  • A novel synthetic route to spirodienonamides was successfully established.
  • The process provides straightforward access to molecules featuring an acyl-functionalized all-carbon quaternary center.
  • The carbamoylxanthates were effectively converted into the desired spirodienonamide products.

Conclusions:

  • The described dearomatizing spiroacylation offers a valuable new method for constructing spirocyclic compounds.
  • This methodology facilitates the synthesis of complex spirodienonamides with important structural features.
  • The study expands the toolkit for creating molecules with all-carbon quaternary centers.