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Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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Nucleophilic Aromatic Substitution: Elimination–Addition01:11

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

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Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
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Diazonium Group Substitution: –OH and –H01:19

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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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Preparation of 1° Amines: Azide Synthesis01:22

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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Un enfoque no carbenoide para las imidazolidinas a través de la anulación catalizada de

Vittorio Ciccone1, Sara Caselli1, Giacomo Mari1

  • 1Department of Biomolecular Sciences, Section of Chemistry and Pharmaceutical Technologies, University of Urbino "Carlo Bo", Via Ca' Le Suore, 2, 61029 Urbino, Italy.

The Journal of organic chemistry
|August 29, 2025
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Una nueva reacción catalizada por ZnCl2 permite la síntesis de marcos de imidazolidina con centros de carbono cuaternarios utilizando reactivos seguros. Este método ofrece una alternativa más segura a los compuestos diazo peligrosos para crear moléculas orgánicas complejas.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Metodología sintética

Sus antecedentes:

  • Los reactivos diazoeléctricos peligrosos se usan comúnmente en la síntesis orgánica.
  • El desarrollo de alternativas más seguras y eficientes es crucial para la química sostenible.
  • Las estructuras de imidazolidina son motivos estructurales importantes en la química medicinal.

Objetivo del estudio:

  • Desarrollar una nueva vía sintética para las estructuras de la imidazolidina.
  • Explorar una nueva reacción de anulación catalítica utilizando materiales de partida fácilmente disponibles.
  • Proporcionar una alternativa más segura a los métodos sintéticos basados en diazo.

Principales métodos:

  • Se desarrolló una reacción de anulación formal [2 + 2 + 1] catalizada por ZnCl2.
  • Los 1,2-diaza-1,3-dienos (DD) reaccionaron con las hexahidro-1,3,5-triazinas (HT).
  • Se utilizó un enfoque de tres componentes en dos pasos para sintetizar imidazolidinas sustituidas.

Principales resultados:

  • La reacción formó exitosamente estructuras de imidazolidina que contienen centros de carbono cuaternarios.
  • Se observó una reactividad única de 4-alcoxicarbonilo-1,2-diaza-1,3-butadienos similar a la del carbeno.
  • El método ofrece una alternativa segura y eficiente a los reactivos diazoeléctricos peligrosos.

Conclusiones:

  • Se ha establecido una reacción de anulación catalizada por ZnCl2 nueva y sin precedentes.
  • Este método ofrece una herramienta valiosa para la síntesis de derivados complejos de la imidazolidina.
  • La estrategia desarrollada evita la necesidad de compuestos diazónicos peligrosos, promoviendo prácticas sintéticas más ecológicas.