Video Experimental Relacionado

Updated: Jun 24, 2025

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

Reducción multielectrónica de ésteres mediante un catalizador de fotorreducción de diazabencenato de etenio

Shintaro Okumura^1,2, Shusuke Hattori^1,2, Lisa Fang¹

¹Institute for Molecular Science (IMS), Okazaki, Aichi 444-8787, Japan.

Journal of the American Chemical Society

|June 13, 2024

Resumen

Un nuevo fotocatalizador, el N-BAP, permite la reducción de ésteres a alcoholes con luz visible. También facilita la síntesis de 1,2-diolos asimétricos a través de reacciones de adición nucleófilas.

Área de la Ciencia:

Química orgánica
Fotocatálisis
Química sintética

Sus antecedentes:

La fotocatálisis con luz visible ofrece un enfoque sostenible para la síntesis orgánica.
El desarrollo de fotocatalizadores eficientes para las reducciones desafiantes es crucial.
Los ésteres son grupos funcionales comunes que pueden ser difíciles de reducir selectivamente.

Objetivo del estudio:

Diseñar y sintetizar un nuevo fotocatalizador de diazabenzacenafteno (N-BAP).
Investigar la actividad fotocatalítica del N-BAP para la reducción de ésteres bajo luz visible.
Explorar la utilidad sintética de los intermedios generados para futuras transformaciones.

Principales métodos:

Síntesis en un solo paso del fotocatalizador N-BAP.
Irradiación con luz visible de ésteres en presencia de N-BAP y oxalato de amonio.
Caracterización de los productos de reacción mediante técnicas analíticas estándar.

Principales resultados:

El N-BAP demostró altas capacidades de fotorreducción y absorción de luz visible.
Se logró una reducción eficiente de cuatro electrones de ésteres a alcoholes utilizando N-BAP.
Los intermediarios de carbanión generados se sometieron a adición nucleofílica a los compuestos carbonílicos, produciendo 1,2-diolos asimétricos.

Conclusiones:

El N-BAP es un fotocatalizador altamente efectivo para la reducción de ésteres mediada por luz visible.
El método desarrollado proporciona una nueva vía para los alcoholes y los 1,2-diolos asimétricos.
Este trabajo amplía el alcance de las transformaciones fotocatalíticas utilizando materiales de partida fácilmente disponibles.

Más Videos Relacionados

Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

Published on: June 21, 2017

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

Published on: March 20, 2014

Videos de Conceptos Relacionados

Esters to Alcohols: Hydride Reductions

Esters to Alcohols: Hydride Reductions

Esters are reduced to primary alcohols when treated with a strong reducing agent like lithium aluminum hydride. The reaction requires two equivalents of the reducing agent and proceeds via an aldehyde intermediate.
Lithium aluminum hydride is a source of hydride ions and functions as a nucleophile. The mechanism proceeds in three steps. Firstly, the nucleophilic hydride ion attacks the carbonyl carbon of the ester to form a tetrahedral intermediate. Subsequently, the carbonyl group re-forms,...

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview

α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview

The pinacol and McMurry reactions involve the reductive coupling of ketones or aldehydes. Similarly, the bimolecular reductive coupling of two ester molecules in the presence of sodium metal in an aprotic solvent yields an α-hydroxy ketone product. The α-hydroxy ketone is also called acyloin, so the reaction is referred to as ‘acyloin condensation.’

Alcohols from Carbonyl Compounds: Reduction

Alcohols from Carbonyl Compounds: Reduction

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...