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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

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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.
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Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

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Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone. 
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Radical Reactivity: Nucleophilic Radicals01:16

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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...
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Preparation and Use of Samarium Diiodide SmI2 in Organic Synthesis: The Mechanistic Role of HMPA and NiII Salts in the Samarium Barbier Reaction
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Transformaciones reductoras catalizadas por el samario habilitadas por ligandos de la antena de luz visible

Takahito Kuribara1,2, Ayahito Kaneki2, Yu Matsuda2

  • 1Institute for Advanced Academic Research, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.

Journal of the American Chemical Society
|July 20, 2024
PubMed
Resumen

Este estudio introduce un nuevo catalizador de samario (Sm) con un ligando de antena de luz visible para transformaciones reductivas eficientes. El catalizador permite condiciones suaves para el acoplamiento de pinacol y varias otras reacciones de reducción de un solo electrón.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • La fotoquímica

Sus antecedentes:

  • Los reactivos de samario (Sm) divalentes son cruciales para la transferencia de un solo electrón en las transformaciones reductoras.
  • Las aplicaciones catalíticas de los reactivos Sm son a menudo difíciles debido a problemas de estabilidad y reactividad.
  • El desarrollo de reacciones suaves y eficientes catalizadas por Sm es un área de investigación en curso.

Objetivo del estudio:

  • Diseñar un nuevo ligando para reacciones de reducción catalizadas por samario.
  • Para lograr condiciones de reacción suaves mediante la irradiación de luz visible.
  • Para ampliar el alcance de las transformaciones reductoras de un solo electrón catalizadas por samario.

Principales métodos:

  • Diseño de un ligando de óxido de fosfina bidentado con una antena de luz visible de 9,10-difenilantraceno.
  • Desarrollo del acoplamiento pinacol catalizado por samario de cetonas de arilo y aldehídos utilizando un catalizador de 1 mol % Sm.
  • Utilizando una amina orgánica (DIPEA) como un reductor suave de sacrificio.
  • Investigar el mecanismo de reacción mediante estudios mecanicistas.

Principales resultados:

  • Desarrollo exitoso de un sistema catalítico para el acoplamiento de pinacol en condiciones suaves.
  • Demostrando el papel del ligando en la reducción de Sm{III} a Sm{II} mediante la irradiación con luz visible.
  • Expansión del sistema catalítico a varias transformaciones reductoras de un solo electrón, incluido el acoplamiento cruzado de pinacol, el acoplamiento aza-pinacol, la dimerización de flavona, la escisión de enlaces C-O, la apertura de anillos C-C de ciclopropano, el acoplamiento cetilo-olefina y el acoplamiento cruzado de radicales cetilo y α-amino.

Conclusiones:

  • Un nuevo ligando de antena de luz visible permite transformaciones reductivas eficientes catalizadas por samario en condiciones suaves.
  • El sistema catalítico desarrollado amplía la aplicabilidad del samario en la síntesis orgánica.
  • Este enfoque ofrece una nueva estrategia para utilizar la luz en reacciones de transferencia de un solo electrón mediadas por samario.