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Related Concept Videos

Oxidation Numbers03:14

Oxidation Numbers

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In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
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EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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Pyruvate Oxidation

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After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Acid Halides to Ketones: Gilman Reagent01:14

Acid Halides to Ketones: Gilman Reagent

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Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen...
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Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents01:13

Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents

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Carboxylic acids can be prepared by the carboxylation of Grignard reagents (RMgX). This method is convenient for converting alkyl (primary, secondary or tertiary), vinyl, benzyl, and aryl halides to carboxylic acids with one additional carbon than the starting RMgX.
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Scalable Syntheses of Graphene Oxide and Reduced Graphene Oxide using Cascade Design Oxidation and Highly Basic Reduction Reactions
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Graphene Oxide: Carbocatalyst or Reagent?

Stanislav Presolski1, Martin Pumera2

  • 1Division of Science, Yale-NUS College, 16 College Ave West, Singapore, 138527, Singapore.

Angewandte Chemie (International Ed. in English)
|October 20, 2018
PubMed
Summary
This summary is machine-generated.

Graphene oxide is a reagent, not a catalyst, in benzyl alcohol conversion, forming benzaldehyde and dibenzyl ether. This study clarifies carbocatalysis mechanisms and proper evaluation of carbon-based materials.

Keywords:
carbocatalystsgraphene oxideheterogeneous catalysisoxidationsynthetic methods

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Area of Science:

  • Green Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Metal-free carbon-based materials offer sustainable organic synthesis pathways.
  • The catalytic mechanisms of these materials are often unclear due to their ill-defined nature.
  • Accurate product analysis is crucial for classifying materials as catalysts per IUPAC definitions.

Purpose of the Study:

  • To investigate the role of graphene oxide in the conversion of benzyl alcohol to benzaldehyde.
  • To elucidate the reaction mechanism and identify all significant products.
  • To re-evaluate the classification of graphene oxide in carbocatalysis.

Main Methods:

  • Reaction of benzyl alcohol with graphene oxide.
  • Analysis of reaction products using analytical techniques (e.g., GC-MS, NMR).
  • Comparison of experimental results with the definition of catalysis.

Main Results:

  • Graphene oxide was reduced during the reaction.
  • Benzaldehyde was formed as the primary product.
  • Dibenzyl ether was identified as a major side product, indicating a non-catalytic pathway.
  • Graphene oxide acts as a reagent, not a catalyst, in this transformation.

Conclusions:

  • Graphene oxide functions as a reagent in the conversion of benzyl alcohol.
  • The formation of dibenzyl ether necessitates reclassifying graphene oxide.
  • This work contributes to the rigorous evaluation of carbocatalytic reactions.