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Crown Ethers02:36

Crown Ethers

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Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.0K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Oxymercuration-Reduction of Alkenes02:36

Oxymercuration-Reduction of Alkenes

7.4K
Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.5K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Updated: May 31, 2025

Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
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Crown ether functionalization boosts CO2 electroreduction to ethylene on copper-based MOFs.

Xuan Zheng1, Siheng Yang1, Dingwen Chen1

  • 1Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, P. R. China. liruixiang@scu.edu.cn.

Chemical Communications (Cambridge, England)
|January 23, 2025
PubMed
Summary
This summary is machine-generated.

Crown ether modification boosts copper-based metal-organic frameworks for converting carbon dioxide into ethylene. This enhances ethylene selectivity and production efficiency, offering a sustainable energy solution.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Carbon dioxide (CO2) electroconversion is crucial for sustainable energy and environmental remediation.
  • Copper-based metal-organic frameworks (MOFs) show potential for CO2 reduction but require optimization for selectivity.
  • Ethylene (C2H4) is a valuable chemical feedstock produced via CO2 electroconversion.

Purpose of the Study:

  • To investigate the effect of crown ether (CE) modification on the performance of copper-based MOFs for CO2 electroconversion to ethylene.
  • To enhance the selectivity and faradaic efficiency (FE) of ethylene production.
  • To elucidate the mechanism behind CE-enhanced catalytic activity.

Main Methods:

  • Synthesis and characterization of crown ether-modified copper-based MOFs (CuBTC, CuBDC, CuBDC-NH2).
  • Electrochemical testing of catalysts for CO2 reduction, including current density and faradaic efficiency measurements.
  • In situ Fourier transform infrared spectroscopy (FTIR) to study reaction intermediates and catalyst behavior.

Main Results:

  • Crown ether modification significantly increased C2H4 selectivity and FE in CuBTC, CuBDC, and CuBDC-NH2 by 3.1, 1.7, and 2.4 times, respectively.
  • CuBTC modified with crown ether achieved the highest C2H4 FE of approximately 52% at 120 mA cm-2.
  • In situ FTIR and control experiments indicated that CE stabilizes Cu+ during catalyst reconstruction, favoring Cu2O formation and enhancing *CO adsorption via K+ enrichment.

Conclusions:

  • Crown ether modification is an effective strategy to improve the performance of copper-based MOFs for selective CO2 electroconversion to ethylene.
  • The enhanced performance is attributed to CE-induced catalyst reconstruction, stabilization of Cu+, and improved *CO adsorption and C-C coupling.
  • This work provides insights into designing advanced catalysts for efficient and selective CO2 utilization.