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Alcohols from Carbonyl Compounds: Reduction02:23

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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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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

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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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Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

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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...
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Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
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Hydrolysis of Chlorobenzene to Phenol: Dow Process01:10

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Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
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Carboxymethyl β-Cyclodextrin Assistance for the 4-Nitrophenol Reduction Using Cobalt-Based Layered Double Hydroxides.

Alexia Demeester1, Fatima Douma1, Renaud Cousin2

  • 1Unité de Catalyse et Chimie du Solide (UCCS), UMR 8181, Université de Lille, CNRS, Centrale Lille, Université d'Artois, rue Jean Souvraz, SP 18, 62300 Lens, France.

International Journal of Molecular Sciences
|June 27, 2024
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Summary

New cobalt-aluminum layered double hydroxides incorporating carboxymethyl β-cyclodextrin (CMβCD) enhance 4-nitrophenol reduction. These hybrid materials show improved catalytic activity and reusability, demonstrating the synergistic effect of the layered structure and CMβCD.

Keywords:
carboxymethyl β-cyclodextrincobaltlayered double hydroxidesnitroaromatics

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Layered double hydroxides (LDHs) are versatile materials with applications in catalysis.
  • Cobalt-based materials are effective catalysts for various chemical transformations.
  • Cyclodextrins can modify material properties and enhance catalytic performance.

Purpose of the Study:

  • To synthesize and characterize cobalt-aluminum layered double hydroxides intercalated with carboxymethyl β-cyclodextrin (CMβCD).
  • To evaluate the catalytic activity of these hybrid materials for the reduction of 4-nitrophenol.
  • To investigate the role of the layered structure and CMβCD in the catalytic process.

Main Methods:

  • Coprecipitation synthesis of cobalt-aluminum-layered double hydroxides.
  • Physicochemical characterization using XRD, FTIR, and TGA.
  • Catalytic evaluation of 4-nitrophenol reduction in an aqueous medium.

Main Results:

  • Successful intercalation of CMβCD into the layered double hydroxide structure without structural damage.
  • CoAl_CMβCD hybrid materials exhibited higher catalytic activity for 4-nitrophenol reduction compared to CMβCD-free materials.
  • Experimental controls confirmed the beneficial effects of both the layered double hydroxide structure and the CMβCD component.
  • CMβCD also demonstrated a positive effect as an additive, and the CoAl_CO3 material showed reusability over five cycles.

Conclusions:

  • Cobalt-aluminum layered double hydroxides intercalated with CMβCD are effective catalysts for 4-nitrophenol reduction.
  • The hybrid structure enhances catalytic performance, likely due to synergistic effects between the LDH and CMβCD.
  • These materials offer a promising platform for developing efficient and reusable catalysts.