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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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Structure and Bonding
Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
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Structure and Nomenclature of Epoxides02:38

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Cyclic ethers are heterocyclic compounds with an oxygen atom in the ring along with carbon atoms. They are named depending on the number of carbon atoms present in their ring system. Cyclic ethers with a three-membered ring system are called “oxirane”, four-membered ring systems as “oxetane”, five-membered ring systems as “oxolane”, and six-membered ring systems as “oxane”. The cyclic structure of these rings imposes angle strain, and this strain...
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Functional groups are group of atoms with specific chemical properties that occur within organic molecules and sometimes denoted as “R”. Functional groups are found along the carbon backbone of macromolecules can form chains or rings of carbon atoms. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.  
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Éter de corona 2D enmarcado covalentemente con multifuncionalidad química

Jinseok Kim1, Sungin Kim1,2, Jinwook Park1

  • 1School of Chemical and Biological Engineering, and Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea.

Journal of the American Chemical Society
|February 8, 2024
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Resumen
Este resumen es generado por máquina.

Un nuevo marco de carbono-oxígeno (CO) con agujeros de éter en la corona cataliza eficientemente la fijación de CO2 con epóxidos. Este material escalable y personalizable mejora significativamente las tasas de conversión de CO2, mostrando un gran potencial para diversas aplicaciones.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Catálisis
  • Química orgánica

Sus antecedentes:

  • El desarrollo de catalizadores eficientes para la fijación de CO2 es crucial para la química sostenible.
  • Se necesitan nuevos materiales porosos con propiedades sintonizables para transformaciones químicas avanzadas.

Objetivo del estudio:

  • Para sintetizar y caracterizar un nuevo marco cristalino 2D, CO, con agujeros de éter de corona.
  • Investigar la actividad catalítica del CO en la fijación de CO2 con epóxidos.
  • Explorar el potencial de modificación química del marco del CO.

Principales métodos:

  • Síntesis a escala de gramos y caracterización del marco 2D CO.
  • Evaluación catalítica del sistema CO/KI para la fijación de CO2 con epiclorhidrina y éter glicídico de alilo.
  • Modificación química del marco de CO con electrófilos (AGE) y nucleófilos (EEA).

Principales resultados:

  • El marco de CO exhibe una alta estabilidad química y activa eficientemente KI para la fijación de CO2.
  • CO/KI mejora significativamente las tasas de conversión de CO2 para la epiclorhidrina (99,9%) y el éter glicídico de alilo (74,2%).
  • Los marcos modificados de CO (CO-AGE, CO-EEA) muestran mejores eficiencias de fijación de CO2 (97,2% y 99,9%).

Conclusiones:

  • El marco de CO desarrollado es un material escalable, duradero y personalizable para la catálisis.
  • La estructura única y las propiedades sintonizables del CO ofrecen un potencial significativo para el diseño de materiales funcionales avanzados.
  • Este trabajo presenta un enfoque prometedor para la utilización eficiente de CO2 a través de la fijación catalítica.