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Videos de Conceptos Relacionados

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Preparation and Reactions of Thiols02:33

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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Structure and Nomenclature of Thiols and Sulfides02:17

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5.0K
Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
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Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.
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2.9K
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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Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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Formosulfatiazol: una revisión estructural

Claudio Maestri1,2, Toni Grell3, Fabio Travagin1

  • 1Dipartimento di Scienze del Farmaco, Università del Piemonte Orientale, Largo Guido Donegani 2, Novara (NO), 28100, Italy.

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|September 3, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Se encontró que el formosulfatiazol (FSTz), un prodrogo utilizado para las infecciones bacterianas, tiene una estructura de ciclofano bien definida, no un polímero indefinido como se pensaba anteriormente. Este descubrimiento revisa nuestra comprensión de este importante ingrediente farmacéutico.

Palabras clave:
Cloruro de hidrógenoCíclofándifracción de electronesFormosulfatiazol y sus derivadosRevisión estructural

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Área de la Ciencia:

  • Química farmacéutica
  • Química orgánica
  • Medicina Veterinaria

Sus antecedentes:

  • El formosulfatiazol (FSTz) es un ingrediente farmacéutico activo sintético (API) introducido en 1948.
  • FSTz funciona como un prodrogo, liberando sulfatiazol y formaldehído para el tratamiento de infecciones bacterianas y protozoarias en animales.
  • La estructura molecular precisa de FSTz se consideraba anteriormente un polímero no definido.

Objetivo del estudio:

  • Analizar sistemáticamente la estructura del formosulfatiazol (FSTz).
  • Para aclarar la arquitectura molecular de FSTz, desafiando las suposiciones anteriores.
  • Comprender las implicaciones de su estructura en su actividad prodrug.

Principales métodos:

  • Se emplearon técnicas analíticas avanzadas para el esclarecimiento estructural.
  • Se realizó un análisis químico para caracterizar el producto de condensación.
  • Se utilizaron métodos espectroscópicos y cristalográficos para determinar la estructura molecular.

Principales resultados:

  • El estudio reveló que FSTz posee un esqueleto de ciclófano bien definido.
  • La estructura polimérica no definida anteriormente asumida fue revisada a un producto de condensación ciclodímero.
  • Se caracterizó definitivamente la estructura molecular precisa de FSTz.

Conclusiones:

  • El formosulfatiazol (FSTz) es un compuesto ciclodímero con una estructura ciclófana.
  • Este hallazgo corrige el concepto erróneo de su naturaleza polimérica.
  • La comprensión estructural revisada es crucial para su aplicación y desarrollo farmacéuticos.