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Videos de Conceptos Relacionados

Preparation of Alcohols via Addition Reactions02:15

Preparation of Alcohols via Addition Reactions

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The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
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Conversion of Alcohols to Alkyl Halides02:48

Conversion of Alcohols to Alkyl Halides

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This lesson delves into the conversion of alcohols to corresponding alkyl halides and the mechanism of action for different reagents. Typically, the hydroxyl group is first protonated to convert it to a stable leaving group. Consequently, based on the starting alcohol, the mechanism undergoes either of the nucleophilic substitution routes, SN1 or SN2. Tertiary alkyl halides are made using the two-step SN1 mechanism that occurs via a carbocation intermediate, which is stabilized by...
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Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

11.0K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
11.0K
Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

16.1K
If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
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Preparation of Alcohols via Substitution Reactions01:38

Preparation of Alcohols via Substitution Reactions

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Overview
Alcohols can be synthesized from alkyl halides via nucleophilic substitution reactions. The highly polar carbon-halogen bond in the substrate makes halide a good leaving group.  The hydroxide ion or water can act as a nucleophile to take the place of halide and form an alcohol. The substitution reactions occur via two different reaction pathways, SN1 or SN2,  depending on the nature of carbon attached to the halide.
Primary alcohols are synthesized from primary alkyl halides, and the...
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Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

12.0K
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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Conversión selectiva de CO a alcoholes multicarbónicos mediante el equilibrio de las configuraciones de adsorbados

Shu-Ping Sun1, Xiao-Long Zhang1, Xue-Peng Yang2

  • 1Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China.

Journal of the American Chemical Society
|December 2, 2025
PubMed
Resumen

Los catalizadores de cobre mejorados con plata mejoran la conversión electroquímica del monóxido de carbono (CO) en alcoholes, incluido el n-propanol. La electrólisis pulsada y el diseño del catalizador permiten una alta selectividad y eficiencia para la producción química sostenible.

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Área de la Ciencia:

  • La electroquímica
  • Catálisis
  • Ciencias de los materiales

Sus antecedentes:

  • La reducción electroquímica del monóxido de carbono (CO) es una vía clave para producir alcoholes valiosos.
  • El desarrollo de catalizadores eficientes y selectivos es crucial para el avance de las tecnologías de conversión de CO.

Objetivo del estudio:

  • Mejorar la selectividad y la eficiencia de la electrorreducción de CO a alcoholes, en particular al n-propanol.
  • Investigar el papel de la incorporación de plata y la electrólisis pulsada en el rendimiento del catalizador.

Principales métodos:

  • Incorporación de plata (Ag) en catalizadores de cobre derivados del óxido.
  • Electrolisis en modo pulsado para la reducción de CO.
  • Integración del catalizador en un electrolizador de flujo continuo.

Principales resultados:

  • Se logró una selectividad del 75,7% para los alcoholes, con un 48,8% para el n-propanol, utilizando cobre mejorado con Ag bajo electrólisis pulsada.
  • Se ha demostrado una eficiencia Faradaic del 66,7% para los alcoholes multicarbónicos (40,4% n-propanol) durante 116 horas en un electrolizador de flujo.
  • Se ha identificado la adsorción de superficie de hidróxido ajustable y la unión de hidrógeno optimizada como factores clave para mejorar la selectividad.

Conclusiones:

  • La incorporación de plata y la electrólisis pulsada mejoran sinérgicamente la selectividad de electrorreducción de CO.
  • El sistema de catalizador desarrollado es prometedor para la producción eficiente y estable de n-propanol y otros alcoholes.
  • Este trabajo avanza en las tecnologías de conversión electroquímica para la síntesis sostenible de alcohol.