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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
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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.
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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.
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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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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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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.
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Reducción del nitrógeno a amoníaco catalizado por complejos de diámido de molibdeno

Lasantha A Wickramasinghe1, Takaya Ogawa1, Richard R Schrock1

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|June 23, 2017
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Un nuevo complejo de molibdeno con un ligando de diamido rígido cataliza la reducción de nitrógeno a amoníaco. Este proceso, utilizando cobaltoceno y una fuente de protones, logra una eficiencia de electrones de hasta el 43%.

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Área de la Ciencia:

  • Química organometálica
  • Catálisis
  • Fijación de nitrógeno

Sus antecedentes:

  • El desarrollo de catalizadores eficientes para la reducción de nitrógeno es crucial para la síntesis de amoníaco.
  • Los complejos de molibdeno con ligandos diamido han demostrado ser prometedores en las reacciones de fijación de nitrógeno.
  • Los ligandos conformalmente rígidos pueden influir en la estabilidad y la reactividad del catalizador.

Objetivo del estudio:

  • Para sintetizar y caracterizar un nuevo complejo de molibdeno con un ligando diamido a base de piridina.
  • Investigar la actividad catalítica de este complejo en la reducción del nitrógeno molecular a amoníaco.
  • Determinar la eficiencia y las condiciones de este proceso de reducción del nitrógeno.

Principales métodos:

  • Síntesis del complejo de molibdeno [Ar2N3]Mo (N) (O-t-Bu) a partir de sus precursores.
  • Reducción catalítica del N2 a NH3 en el éter dietílico a temperaturas comprendidas entre -78 y 22 °C.
  • Utilizando el cobalto bis ((cyclopentadienyl) (CoCp*2) como fuente de electrones y el trilato de difenil amonio como fuente de protones.

Principales resultados:

  • El complejo de molibdeno fue preparado con éxito.
  • El complejo demostró actividad catalítica en la reducción del nitrógeno molecular a amoníaco.
  • Se obtuvieron rendimientos de amoníaco de hasta aproximadamente 10 equivalentes por molibdeno.
  • Se observó una eficiencia máxima de electrones de aproximadamente el 43%.

Conclusiones:

  • El complejo de molibdeno sintetizado es un precursor catalizador eficaz para la reducción del nitrógeno.
  • El sistema catalítico funciona bajo condiciones suaves (-78 a 22 °C).
  • El estudio pone de relieve el potencial de los ligandos diamido rígidos en el diseño de catalizadores eficientes de fijación de nitrógeno.