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Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
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Preparation of Aldehydes and Ketones from Alcohols, Alkenes, and Alkynes01:33

Preparation of Aldehydes and Ketones from Alcohols, Alkenes, and Alkynes

Aldehydes and ketones are prepared from alcohols, alkenes, and alkynes via different reaction pathways. Alcohols are the most commonly used substrates for synthesizing aldehydes and ketones. The conversion of alcohol to aldehyde, which involves the oxidation process, depends on the class of the alcohol used and the strength of the oxidizing agent. For instance, primary alcohol will form an aldehyde when treated with a weak oxidizing agent; however, it gets over-oxidized to a carboxylic acid in...
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Alkynes undergo oxidative cleavage in the presence of oxidizing reagents like potassium permanganate and ozone. The triple bond — one σ bond and two π bonds — is completely cleaved, and the alkyne is oxidized to carboxylic acids. When warm and basic aqueous potassium permanganate is used as an oxidizing agent, alkynes are first converted to carboxylate salts via an unstable α-diketone intermediate. Further, a mild acid treatment protonates the carboxylate anions generating free carboxylic acid...

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Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)
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Una reacción de oxidación alifática C-H predeciblemente selectiva para la síntesis de moléculas complejas.

Mark S Chen1, M Christina White

  • 1Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL 61801, USA.

Science (New York, N.Y.)
|November 3, 2007
PubMed
Resumen

Un nuevo catalizador de hierro permite la oxidación selectiva de enlaces C-H no activados utilizando peróxido de hidrógeno (H2O2). Este avance ofrece un control predecible para la síntesis de moléculas complejas, simplificando la química orgánica.

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Área de la Ciencia:

  • Química orgánica es la química orgánica.
  • La catálisis de la catálisis.
  • Metodología sintética de la metodología sintética.

Sus antecedentes:

  • La oxidación del enlace C-H sp3 no activado es crucial para la síntesis orgánica, pero requiere catalizadores altamente reactivos y selectivos.
  • Los métodos existentes a menudo carecen de selectividad predecible o requieren grupos de dirección.

Objetivo del estudio:

  • Desarrollar un nuevo catalizador para la oxidación eficiente y selectiva de enlaces C-H sp3 no activados.
  • Para demostrar una selectividad predecible basada en las propiedades electrónicas y estéricas del sustrato.
  • Explorar el uso de grupos de dirección para la formación de productos específicos.

Principales métodos:

  • Desarrollo de un catalizador de moléculas pequeñas basado en hierro (Fe).
  • Utilizando peróxido de hidrógeno (H2O2) como el oxidante.
  • Prueba de la reactividad y selectividad del catalizador en una amplia gama de sustratos, incluidos productos naturales complejos.

Principales resultados:

  • El catalizador basado en Fe demuestra una alta reactividad y una selectividad predecible para la oxidación C-H sin grupos de dirección.
  • La selectividad se rige por la naturaleza electrónica y estérica de los enlaces C-H.
  • Los grupos de dirección de carboxilato permiten la formación de lactonas de anillo de cinco miembros.
  • Se modificaron productos naturales complejos en enlaces C-H específicos con rendimientos preparatoriamente útiles.

Conclusiones:

  • El catalizador desarrollado proporciona un método general y predecible para la oxidación alifática C-H.
  • Este enfoque simplifica significativamente la síntesis de moléculas complejas.
  • El catalizador expande la utilidad sintética de la oxidación C-H en la química orgánica.