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Related Concept Videos

Radical Oxidation of Allylic and Benzylic Alcohols01:21

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Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
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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 Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

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Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
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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.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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Radical Formation: Overview01:03

Radical Formation: Overview

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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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An Unexpected Controlled New Oxidant: SO4(·-).

Cui-Bing Bai1, Nai-Xing Wang1, Xing-Wang Lan1

  • 1Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

Scientific Reports
|February 3, 2016
PubMed
Summary
This summary is machine-generated.

A novel metal-free oxidation system utilizing sulfate radical anion (SO4·−) efficiently converts aromatic alcohols to aldehydes. This controlled oxidation occurs at room temperature without acid formation, offering a greener synthetic route.

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Area of Science:

  • Organic Chemistry
  • Oxidation Reactions
  • Green Chemistry

Background:

  • Developing efficient and selective oxidation methods is crucial in organic synthesis.
  • Metal-free catalytic systems are desirable for environmental and economic reasons.
  • Sulfate radical anion (SO4·−) is a potent oxidant but requires controlled generation.

Purpose of the Study:

  • To introduce a new, easily prepared, metal-free oxidation system for aromatic alcohols.
  • To demonstrate the utility of sulfate radical anion (SO4·−) as a controllable oxidant.
  • To achieve high yields of aromatic aldehydes without acid byproducts.

Main Methods:

  • Preparation of sulfate radical anion (SO4·−) by mixing sodium dithionite (Na2S2O4) and tert-butyl hydroperoxide (TBHP).
  • Oxidation of various aromatic alcohols using the Na2S2O4/TBHP system at room temperature.
  • Detection and confirmation of SO4·− generation using electron paramagnetic resonance (EPR) spectroscopy with DMPO spin-trapping.

Main Results:

  • The Na2S2O4/TBHP system effectively oxidized a range of aromatic alcohols to their corresponding aldehydes.
  • Good to excellent yields were obtained for the desired aldehyde products.
  • The presence of SO4·− was confirmed by EPR, indicating its role in the oxidation process.
  • No acid formation was observed during the reaction.

Conclusions:

  • A novel and efficient metal-free oxidation system for converting aromatic alcohols to aldehydes has been developed.
  • The system relies on the controlled generation and use of sulfate radical anion (SO4·−).
  • This method offers a practical and environmentally friendly approach for aldehyde synthesis.