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Related Concept Videos

Esters to β-Ketoesters: Claisen Condensation Mechanism01:08

Esters to β-Ketoesters: Claisen Condensation Mechanism

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Regular Claisen condensation involves the synthesis of β-ketoesters by combining identical ester molecules bearing two α hydrogens in the presence of an alkoxide base. The reaction commences with the deprotonation of the acidic α hydrogen by the base to form a resonance stabilized ester enolate. This nucleophilic ion then attacks the carbonyl center of another ester molecule to generate a tetrahedral alkoxide intermediate. Next, the expulsion of the alkoxide group from the...
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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β-Dicarbonyl Compounds via Crossed Claisen Condensations01:18

β-Dicarbonyl Compounds via Crossed Claisen Condensations

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Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds.  The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

11.8K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
11.8K
Acid Halides to Ketones: Gilman Reagent01:14

Acid Halides to Ketones: Gilman Reagent

2.7K
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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Related Experiment Video

Updated: May 24, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Co Single-Atom Catalysis for High-Efficiency LiCl/Cl2 Conversion in Rechargeable Lithium-Chlorine Batteries.

Peicai Li1, Chenyu Ma2, Yufeng Wang1

  • 1State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|March 4, 2025
PubMed
Summary

This study introduces a cobalt single-atom catalyst that significantly improves lithium-chlorine battery performance. The catalyst enhances chlorine gas adsorption and lithium chloride conversion, enabling long cycle life across wide temperature ranges.

Keywords:
Cl2 adsorptionCl2/LiCl conversion efficiencyCo single‐atom site catalystlithium‐chlorine secondary batteries

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Lithium-chlorine (Li-Cl2) batteries offer high energy density but face challenges with chlorine gas (Cl2) adsorption and lithium chloride (LiCl) conversion efficiency.
  • Poor cyclability in Li-Cl2 batteries stems from weak Cl2 adsorption and low LiCl conversion, leading to active material loss.

Purpose of the Study:

  • To investigate the critical role of synergistic Cl2 adsorption and LiCl reaction energy barriers in enhancing Cl2/LiCl conversion efficiency.
  • To develop a novel catalyst that addresses the limitations of conventional electrode materials in Li-Cl2 secondary batteries.

Main Methods:

  • Development of a cobalt (Co) single-atom site catalyst with a Co-N4 coordination environment.
  • Evaluation of the catalyst's effect on the Cl2/LiCl transformation barrier and Cl2 adsorption.
  • Testing the performance of the Li-Cl2@Co-NC battery under various current densities and temperatures.

Main Results:

  • The Co-N4 catalyst significantly reduced the transformation barrier of LiCl to Cl2 and enhanced Cl2 adsorption.
  • The developed Li-Cl2@Co-NC battery demonstrated a 0.6 V reduction in polarization voltage under high current densities.
  • The battery achieved over 600 cycles at 1500 mA g-1 at room temperature and 650 cycles at 500 mA g-1 at -40 °C.

Conclusions:

  • The research successfully overcame the cycle stability limitations in high-current Li-Cl2 batteries.
  • The Co-N4 catalyst provides a viable strategy for developing long-cycle-life batteries with a wide operating temperature range.
  • This work paves the way for advanced energy storage solutions utilizing Li-Cl2 chemistry.