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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Diphenoquinhydrones and Related Hydrogen-Bonded Charge-Transfer Complexes.

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Researchers created new diphenoquinhydrones by combining specific molecules. These materials exhibit strong intermolecular interactions, offering a modular approach to designing novel charge-transfer materials.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Benzoquinone and hydroquinone form quinhydrone via hydrogen bonds and charge-transfer interactions.
  • Quinhydrone's structure involves alternating components linked by non-covalent forces.

Purpose of the Study:

  • To synthesize and characterize analogous diphenoquinhydrones.
  • To explore the formation of mixed and mismatched quinhydrone structures.
  • To investigate the intermolecular interactions and structural properties of these new complexes.

Main Methods:

  • Cocrystallization of 4,4'-diphenoquinones with 4,4'-dihydroxybiphenyls.
  • Assembly of mixed and mismatched quinhydrone systems.
  • Analysis using geometric parameters, computational studies, and spectroscopic properties.

Main Results:

  • Successful synthesis of analogous, mixed, and mismatched diphenoquinhydrones.
  • Formation of planar chains linked by O-H···O hydrogen bonds.
  • Layered structures with aligned π-donors and π-acceptors driven by charge-transfer interactions.
  • Demonstrated stronger intermolecular interactions compared to simple quinhydrones.

Conclusions:

  • The modular construction principles of quinhydrone formation are generalizable.
  • A broad range of hydrogen-bonded charge-transfer materials can be designed.
  • Diphenoquinhydrones represent a new class of tunable supramolecular materials.