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Videos de Conceptos Relacionados

Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

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Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
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Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia

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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. 
When dissolved in liquid ammonia, an alkali metal, such as sodium,...
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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

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The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
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Preparation of Amines: Reduction of Amides and Nitriles01:13

Preparation of Amines: Reduction of Amides and Nitriles

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Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
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Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

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Reducción de dinitrógeno a amonio en renio utilizando la luz y la transferencia de electrones acoplados a protones

Quinton J Bruch1, Gannon P Connor2, Chun-Hsing Chen1

  • 1Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States.

Journal of the American Chemical Society
|November 22, 2019
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un complejo de renio que divide el nitrógeno (N2) utilizando la luz, convirtiéndolo en amoníaco (NH3) a través de una nueva vía fotolítica. Este avance ofrece una nueva ruta para la fijación de nitrógeno en la catálisis molecular.

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Área de la Ciencia:

  • Química inorgánica
  • Catálisis
  • La fotoquímica

Sus antecedentes:

  • La escisión directa del enlace triple de nitrógeno (N2) por complejos metálicos es crucial para la síntesis de amoníaco (NH3) a través de la catálisis molecular.
  • Los métodos existentes a menudo requieren condiciones duras o carecen de eficiencia para romper el fuerte enlace NN.

Objetivo del estudio:

  • Investigar un sistema de renio ligado por pinzas para la transformación directa de N2 a NH3.
  • Para aclarar el mecanismo de reacción que implica la división fotolítica de N2 y la posterior reducción.

Principales métodos:

  • Síntesis y caracterización de un complejo de renio ligado a pinzas, (PONOP) ReCl3.
  • Investigación de las vías de reducción de N2, incluidas las condiciones térmicas y fotolíticas.
  • Análisis espectroscópico y determinación del rendimiento cuántico para la reacción de división N2.

Principales resultados:

  • Se formó un complejo bimetálico de renio-dinitrógeno como producto cinético, que se isomerizó al calentarse.
  • La fotólisis de isómeros específicos con luz azul escindía eficientemente el enlace N2, produciendo un complejo de nitruro de renio octaédrico.
  • El complejo de nitruro se redujo posteriormente a un tetrahidruro de renio, produciendo finalmente amoníaco con un rendimiento del 74%.

Conclusiones:

  • El sistema de renio desarrollado demuestra una nueva vía fotolítica para la escisión de N2, superando las barreras termodinámicas.
  • Este trabajo proporciona una secuencia bien definida para la reducción de N2 a NH3, destacando el potencial de la catálisis impulsada por la luz.
  • Los hallazgos abren nuevas vías para la síntesis eficiente y sostenible de amoníaco utilizando catalizadores moleculares.