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Videos de Conceptos Relacionados

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

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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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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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 Overview01:26

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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Complejos de imido terminal de paladio con carácter de nitreno

Annette Grünwald1,2, Bhupendra Goswami1, Kevin Breitwieser1

  • 1Coordination Chemistry, Saarland University, Campus C4.1, D-66123 Saarbrücken, Germany.

Journal of the American Chemical Society
|May 16, 2022
PubMed
Resumen

Los investigadores sintetizaron complejos de paladio de nitreno singulado, que son cruciales para la catálisis. Estos complejos exhiben una reactividad única, permitiendo varias transformaciones químicas a temperatura ambiente.

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Área de la Ciencia:

  • Química organometálica
  • Catálisis
  • Química inorgánica

Sus antecedentes:

  • Los complejos triplet-nitreno de metales de transición tardíos están bien establecidos y son vitales en los procesos catalíticos.
  • Los ligandos de nitreno singlet han permanecido en gran medida evasivos y difíciles de aislar.

Objetivo del estudio:

  • Síntesis y caracterización de nuevos complejos de imido terminal de paladio con estados básicos singlet.
  • Investigar las propiedades electrónicas y la reactividad de estos complejos de nitreno-paladio.

Principales métodos:

  • Espectroscopía electrónica UV-NIR
  • Estudios computacionales de alto nivel (DFT, STEOM-CCSD, CASSCF/NEVPT2, análisis de las EOS)
  • Difracción de rayos X de un solo cristal (SC-XRD)
  • Análisis elemental, IR, espectroscopia de RMN y MRH

Principales resultados:

  • Se sintetizaron tres complejos de imido terminal de paladio con estados básicos singlet.
  • Los análisis espectroscópicos y computacionales indicaron un carácter significativo de paladio-nitreno.
  • Se aisló y caracterizó completamente un congénero de arilo, mientras que las contrapartes alifáticas eran demasiado reactivas.
  • Los complejos demostraron ambifilicidad, activando varios sustratos y catalizando reacciones como la deshidrogenación y la aminación.

Conclusiones:

  • El aislamiento y la caracterización exitosos de los complejos de nitreno-paladio representan un avance significativo.
  • Estos complejos exhiben perfiles de reactividad únicos, abriendo nuevas vías en la catálisis.
  • Los hallazgos desafían las limitaciones anteriores con respecto a la estabilidad y el aislamiento de las especies de nitreno singlete.