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Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For instance, consider...
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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired molecule. These three...
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Un bloque de construcción de Ru-binaphtholate reactivo con tactilidad de auto-ajuste.

Johanna M Blacquiere1, Carolyn S Higman, Robert McDonald

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Un nuevo bloque de construcción de rutenio-binaftolato (BINO) permite una química de coordinación diversa. Este complejo versátil muestra modos de enlace únicos y facilita la síntesis de varios derivados del rutenio.

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Área de la Ciencia:

  • Química organometálica Química orgánica de los metales.
  • Coordinación Química de la Coordinación
  • Los complejos de rutenio.

Sus antecedentes:

  • Los complejos de rutenio son vitales en la catálisis y la ciencia de los materiales.
  • Los ligandos atropisoméricos como los binaftolatos ofrecen un control estereoquímico único.
  • La exploración de nuevos modos de coordinación de ligandos mejora la versatilidad sintética.

Objetivo del estudio:

  • Para introducir un versátil bloque de construcción de rutenio-binaftolato (BINO).
  • Para investigar nuevos modos de coordinación del ligando BINO con rutenio.
  • Para demostrar la utilidad sintética del complejo BINO para la generación de diversos derivados de rutenio.

Principales métodos:

  • Síntesis de un nuevo complejo de rutenio-binaftolato (7) a partir de RuCl{}{}}}}}}}}}}}}}}}}}}}}} y Tl{}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}
  • Caracterización de los isómeros 7' y 7′′ utilizando técnicas espectroscópicas y difracción de rayos X monocristalino.
  • Exploración de la reactividad del complejo 7 para formar nuevos derivados en condiciones suaves.

Principales resultados:

  • Se sintetizó con éxito un versátil bloque de construcción Ru-BINO (7).
  • Se observó un nuevo modo de enlace BINO η(3)-CCO,η(3)-O'C'C' bis(enolado, lo que destaca la flexibilidad del ligando.
  • El complejo 7 y sus derivados demostraron estabilidad con dos o cuatro ligandos adicionales, lo que permite transformaciones fáciles en complejos de acetonitril, piridina y vinilidina.

Conclusiones:

  • El complejo Ru-BINO reportado proporciona una entrada fácil en la química atropisomérica del binaftolato de rutenio.
  • Los diversos modos de coordinación observados y la estabilización de múltiples ligandos subrayan la flexibilidad de la fracción BINO.
  • El estudio propone (13)C{(1)H} firmas de RMN para varios modos de coordinación BINO, ayudando a la investigación futura en la química BINO de metales tardíos.