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Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat...
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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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Although it is possible to reduce a carboxylic acid to an aldehyde, strong reducing agents, like lithium aluminum hydride (LAH), prohibit a controlled reduction, instead causing the generated aldehyde to instantly over-reduce to a primary alcohol.
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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Solubilizando las moléculas más fácilmente ionizadas y generando poderosos agentes reductores.

Gina M Chiarella1, F Albert Cotton, Jason C Durivage

  • 1Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States.

Journal of the American Chemical Society
|October 29, 2013
PubMed
Resumen

Los nuevos compuestos de W2 con estructuras de rueda de remo exhiben energías de ionización récord bajas y potenciales de oxidación negativa. Estos compuestos estables, fácilmente sintetizados muestran potencial como poderosos agentes reductores en disolventes específicos.

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Área de la Ciencia:

  • Química Inorgánica La Química Inorgánica es la química inorgánica.
  • Química organometálica Química orgánica de los metales.
  • La electroquímica es electroquímica.

Sus antecedentes:

  • Se sabe que los ligandos de guanidinato estabilizan los enlaces entre metales.
  • Las estructuras de rueda de remolque son motivos comunes en los complejos metálicos dinucleares.
  • El ajuste de las propiedades redox es crucial para el desarrollo de nuevos agentes reductores.

Objetivo del estudio:

  • Para sintetizar y caracterizar nuevos compuestos de W2 con ligandos de guanidinato bicíclico.
  • Para investigar las propiedades electrónicas y redox de estos compuestos W2.
  • Evaluar su potencial como agentes reductores estequiométricos.

Principales métodos:

  • Síntesis de los compuestos W2 ((guanidinato bicíclico) 4).
  • Las mediciones electroquímicas (voltametría cíclica) en THF.
  • Computaciones de la teoría de la densidad funcional (DFT).

Principales resultados:

  • Los compuestos exhiben energías de ionización récord bajas (3.4-3.5 eV).
  • Se observaron potenciales de oxidación muy negativos en THF (-1,84 a -1,90 V frente a Ag/AgCl).
  • Los cálculos de DFT correlacionan las energías de ionización de la fase gaseosa con los potenciales redox de la solución y el comportamiento químico.

Conclusiones:

  • Los compuestos W2 sintetizados son térmicamente estables y se preparan fácilmente en alto rendimiento y pureza.
  • Estos compuestos son altamente reactivos y demuestran potencial como agentes reductores estequiométricos.
  • Se sugiere su utilidad para sistemas de disolventes no polares y no protonados.