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Videos de Conceptos Relacionados

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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.
Sulfur Assimilation01:20

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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

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, similar...
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Los tetraedros sustituidos por azufre son tetraedros.

Tatsumi Ochiai1, Masaaki Nakamoto, Yusuke Inagaki

  • 1Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.

Journal of the American Chemical Society
|July 7, 2011
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores sintetizaron nuevos tetraedros sustituidos por azufre y el fenilsulfoniltetraedro. Los espectros UV-vis revelaron interacciones electrónicas en los derivados de azufre, a diferencia del compuesto fenilsulfonilo, con distintas vías de descomposición térmica observadas para cada uno.

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Área de la Ciencia:

  • Química organometálica Química orgánica de los metales.
  • Química sintética de la química sintética.
  • La espectroscopia es una técnica de espectroscopia.

Sus antecedentes:

  • Los tetraedros son hidrocarburos poliédricos tensados.
  • La sustitución de azufre ofrece propiedades electrónicas y de reactividad únicas.
  • Comprender las relaciones estructura-propiedad en sistemas tensos es crucial.

Objetivo del estudio:

  • Para sintetizar nuevos derivados de tetraedro sustituidos por azufre.
  • Para investigar las interacciones electrónicas dentro de estos compuestos utilizando espectroscopia.
  • Para explorar la reactividad térmica y las vías de descomposición de los derivados de tetraedro.

Principales métodos:

  • Síntesis de tris ((trimethylsilyl) tetrahedranyllithium y su reacción con varios disulfuros de diarilo.
  • Caracterización mediante espectroscopia de Resonancia Magnética Nuclear (RMN) y cristalografía de rayos X. Caracterización mediante espectroscopia de Resonancia Magnética Nuclear (RMN) y cristalografía de rayos X.
  • Espectroscopia de absorción UV-vis para sondear las interacciones electrónicas.
  • Estudios de reacción térmica para determinar los productos de descomposición.

Principales resultados:

  • Se han sintetizado con éxito tetraedros estables sustituidos por azufre (2-4) y fenilsulfoniltetraedro (5).
  • Los espectros UV-vis indicaron una interacción σ-π entre el núcleo de tetraedro y las parejas solitarias de azufre en los derivados 2-4.
  • No se observó tal interacción electrónica en el fenilsulfoniltetraedro (5).
  • Derivado de tetraedro 2 fragmentado en dos moléculas de acetileno al calentar.
  • El fenilsulfoniltetraedro (5) se descompone para formar ciclobutadieno.

Conclusiones:

  • La sustitución de azufre en los tetraedros puede conducir a importantes interacciones electrónicas con la estructura del núcleo.
  • La naturaleza del sustituto de azufre (por ejemplo, el grupo fenilsulfonilo) influye en estas interacciones electrónicas.
  • Los tetraedros sustituidos por azufre y los fenilsulfoniltetraedros exhiben distintos mecanismos de descomposición térmica, lo que pone de relieve el impacto de la funcionalización en la reactividad.