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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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Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

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Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
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Amines to Alkenes: Cope Elimination01:14

Amines to Alkenes: Cope Elimination

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Cope elimination reaction involves the conversion of tertiary amines to alkene using hydrogen peroxide under thermal conditions, as depicted in figure 1.
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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Dimerización reductora del CO por una diamida de Na/Mg

Han-Ying Liu1, Ryan J Schwamm1, Samuel E Neale1

  • 1Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, U.K.

Journal of the American Chemical Society
|October 15, 2021
PubMed
Resumen

La reducción de sodio de un complejo de magnesio produce una nueva especie de Mg (I) con un largo enlace Mg-Mg, estabilizado por las interacciones sodio-arilo. Este núcleo tetrametal reacciona con el monóxido de carbono para formar etinediolato.

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Área de la Ciencia:

  • Química orgánica de los metales
  • Química del grupo principal

Sus antecedentes:

  • La síntesis y caracterización de compuestos del grupo principal de baja valencia son de gran interés.
  • Los compuestos de magnesio (I) son raros y sus características únicas de enlace se exploran activamente.

Objetivo del estudio:

  • Sintetizar y caracterizar una nueva especie de magnesio.
  • Investigar la estructura electrónica y la reactividad del compuesto resultante.

Principales métodos:

  • Síntesis reductiva con el metal de sodio.
  • Cristalografía de rayos X para la determinación estructural.
  • Estudios computacionales (por ejemplo, DFT) para el análisis de la estructura electrónica.

Principales resultados:

  • Aislamiento y elucidación estructural de la especie dimérica Mg{I}, [{SiNDipp}MgNa]2, que presenta un enlace largo Mg-Mg (>3,2 Å).
  • Observación de interacciones Na-arilo significativas que estabilizan la estructura.
  • El análisis computacional reveló un núcleo tetrametal contiguo.
  • Reacción con monóxido de carbono que conduce a la formación de etinediolato, mediada por los centros de Mg y Na.

Conclusiones:

  • El compuesto sintetizado representa un raro ejemplo de una especie estable de Mg.
  • La estructura se describe mejor como un núcleo tetrametal, destacando los efectos cooperativos entre Mg y Na.
  • La reactividad con el CO demuestra el potencial de estos compuestos del grupo principal de baja valencia en la activación de moléculas pequeñas.