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Videos de Conceptos Relacionados

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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Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

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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 Electron Transport Chain01:30

The Electron Transport Chain

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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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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.
ROS generation is regulated and maintained at moderate levels necessary...
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Electron Transport Chains01:28

Electron Transport Chains

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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Facile Preparation of 4-Substituted Quinazoline Derivatives
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Formación de metido de quinona quimoenzimática

Tyler J Doyon, Jonathan C Perkins, Summer A Baker Dockrey

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    La biocatálisis mediante el uso de enzimas de hierro específicas genera productos intermedios reactivos de metida de o-quinona en condiciones suaves. Esto permite la funcionalización selectiva de enlaces C-H en cascadas quimioenzimáticas para la síntesis de moléculas complejas.

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    Área de la Ciencia:

    • Química orgánica
    • Biocatálisis
    • Química sintética

    Sus antecedentes:

    • La naturaleza utiliza intermediarios reactivos para la complejidad molecular.
    • La generación selectiva de especies reactivas en condiciones suaves sigue siendo un desafío sintético.

    Objetivo del estudio:

    • Demostrar el biocatálisis para la generación de productos intermedios de metido de o-quinona con alta quimioselectividad.
    • Desarrollar un método suave y acuoso para la funcionalización del enlace C-H.

    Principales métodos:

    • Se utilizaron enzimas de hierro no hemo dependientes del α-cetoglutarato (CitB y ClaD).
    • Se utiliza la hidroxilación biocatalítica de enlaces bencílicos C-H en sustratos de o-cresol.
    • Intercepción de metido de o-quinona facilitada por los nucleófilos/dienófilos en cascadas quimioenzimáticas de un solo recipiente.

    Principales resultados:

    • Se logra una modificación selectiva de los enlaces bencílicos C-H en condiciones acuosas suaves.
    • Se ha demostrado la conversión de bonos C-H en bonos C-C, C-N, C-O y C-S.
    • Modificación y síntesis selectiva del péptido del producto natural (-) -xiloketal D.

    Conclusiones:

    • La biocatálisis ofrece una plataforma poderosa para generar productos intermedios reactivos con una quimioselectividad precisa.
    • Este enfoque quimioenzimático permite una funcionalización eficiente y leve de los enlaces C-H.
    • La metodología es aplicable a la síntesis de moléculas complejas, incluidos los productos naturales y péptidos.