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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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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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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Sharpless Epoxidation02:57

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The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Electrosíntesis quimioselectiva utilizando una polaridad alterna rápida

Yu Kawamata1, Kyohei Hayashi1, Ethan Carlson1

  • 1Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States.

Journal of the American Chemical Society
|October 1, 2021
PubMed
Resumen
Este resumen es generado por máquina.

La reducción quimioselectiva de los compuestos carbonílicos se logra mediante la electrólisis de polaridad alterna rápida (rAP). Este nuevo método electroquímico ofrece un control preciso, superando la electrólisis tradicional de corriente continua y los reactivos químicos en la síntesis orgánica compleja.

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Área de la Ciencia:

  • Química orgánica
  • La electroquímica
  • Metodología sintética

Sus antecedentes:

  • La quimioselectividad en la síntesis orgánica tradicionalmente se basa en reactivos sintonizables o grupos protectores.
  • Los métodos electroquímicos ofrecen control redox pero luchan con múltiples sitios redox activos.
  • La electrólisis de corriente continua (CC) es estándar, mientras que los efectos de la corriente alterna (CA) son poco explorados en la síntesis preparatoria.

Objetivo del estudio:

  • Desarrollar un nuevo enfoque electroquímico para la reducción quimioselectiva precisa de compuestos carbonílicos.
  • Demostrar la explotación estratégica de la corriente alterna (CA) en la síntesis orgánica compleja.
  • Mostrar la utilidad de la polaridad alterna rápida (rAP) para superar los desafíos sintéticos.

Principales métodos:

  • Empleando una forma de onda cuadrada para entregar corriente eléctrica de polaridad alterna rápida (rAP).
  • Investigando la reducción quimioselectiva de los compuestos carbonílicos.
  • Comparación de la electrólisis rAP con la de la corriente continua y los reactivos químicos.

Principales resultados:

  • La electrólisis de polaridad alterna rápida (rAP) permite la reducción quimioselectiva controlada de los compuestos carbonílicos.
  • La reactividad observada con el rAP no puede replicarse utilizando electrólisis de CC o reactivos químicos convencionales.
  • Utilidad sintética demostrada en la eliminación quiral auxiliar y en la síntesis de PROTAC.

Conclusiones:

  • La electrólisis de polaridad alterna rápida (rAP) es una nueva herramienta poderosa para lograr la quimioselectividad en la síntesis orgánica.
  • Este método proporciona una reactividad y un control únicos, ampliando el alcance de la electrosíntesis.
  • La electrólisis rAP ofrece ventajas significativas tanto para los problemas sintéticos clásicos como para las aplicaciones médicas modernas.