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Redox Reactions01:24

Redox Reactions

59.2K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Reactions01:27

Redox Reactions

1.3K
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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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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Aldehydes and Ketones to Alkanes: Wolff–Kishner Reduction01:09

Aldehydes and Ketones to Alkanes: Wolff–Kishner Reduction

5.9K
Wolff–Kishner reduction involves converting aldehydes and ketones to alkanes using hydrazine and a base. The reaction converts a carbonyl group to a methylene group. The method was independently discovered by N. Kishner in 1911 and L. Wolff in 1912. The reduction is carried out in high-boiling solvents such as ethylene glycol and diethylene glycol because heat is required to deprotonate the N–H proton in one of the reaction steps.                                       ...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

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Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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A redox-mediated Kemp eliminase.

Aitao Li1,2, Binju Wang3, Adriana Ilie1,2

  • 1Department of Biocatalysis, Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany.

Nature Communications
|March 29, 2017
PubMed
Summary
This summary is machine-generated.

Researchers explored a new redox catalysis mechanism for the Kemp elimination reaction using P450-BM3 enzymes. This study offers insights into drug metabolism and the design of novel artificial enzymes.

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Area of Science:

  • Biochemistry
  • Enzyme Catalysis
  • Computational Chemistry

Background:

  • The Kemp elimination reaction, traditionally acid/base-catalyzed, is a key model for designing enzymes with novel functions.
  • Understanding enzyme mechanisms is crucial for protein science and drug metabolism studies.

Purpose of the Study:

  • To investigate an alternative redox catalysis mechanism for the Kemp elimination using P450-BM3.
  • To elucidate the mechanistic pathway of this redox-mediated reaction.
  • To explore implications for drug metabolism and artificial enzyme design.

Main Methods:

  • Utilized P450-BM3 for redox catalysis of the Kemp elimination.
  • Employed Quantum Mechanics/Molecular Mechanics (QM/MM) computational methods.
  • Introduced specific point mutations in P450-BM3 to enhance activity.

Main Results:

  • Identified a novel redox mechanism involving substrate coordination to haem-Fe(II), electron transfer, and N-O heterolysis.
  • Observed formation of a nitrogen radical intermediate and a phenoxyl anion.
  • Demonstrated that two point mutations significantly increased enzyme activity.
  • Provided mechanistic insights relevant to human P450-mediated drug metabolism, such as leflunomide.

Conclusions:

  • Redox catalysis by P450-BM3 offers a distinct pathway for the Kemp elimination.
  • The findings illuminate the metabolism of isoxazole-containing drugs and inform artificial enzyme design.
  • This research provides a foundation for developing future artificial enzymes with tailored catalytic functions.