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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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Structure and Nomenclature of Thiols and Sulfides02:17

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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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Structure and Nomenclature of Alcohols and Phenols02:23

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Overview
Alcohols are one of the most important functional groups in organic chemistry. The name of alcohol comes from the hydrocarbon from which it is derived. Alcohols are organic molecules containing the functional hydroxyl or –OH group directly bonded to carbon. Phenols have an OH group directly attached to a benzene ring. While alcohols are colorless, phenol is a white crystalline compound with a characteristic "hospital smell" odor.
As with other organic compounds, alcohols and...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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Polymer Classification: Architecture01:14

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Oligofenilenos y polifenilenos definidos estructuralmente, sulfofenilados

Thomas J G Skalski1, Benjamin Britton1, Timothy J Peckham1

  • 1Department of Chemistry, Simon Fraser University , Burnaby, British Columbia V5A 1S6, Canada.

Journal of the American Chemical Society
|September 17, 2015
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Resumen

Los investigadores sintetizaron nuevos polifenilenos sulfonados utilizando un monómero único y una cicloadición de Diels-Alder. Este método ofrece un control estructural preciso para el desarrollo de materiales avanzados.

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Área de la Ciencia:

  • Química de los polímeros
  • Síntesis orgánica
  • Ciencias de los materiales

Sus antecedentes:

  • El desarrollo de polímeros sulfonados es crucial para aplicaciones como las membranas de intercambio de protones.
  • El control preciso de la estructura del polímero es esencial para adaptar las propiedades del material.
  • Las rutas sintéticas existentes a menudo carecen de control sobre la regioquímica y el obstáculo estérico.

Objetivo del estudio:

  • Síntesis y caracterización de nuevos oligo- y polifenilenos sulfofenilados.
  • Demostrar la utilidad de un nuevo monómero bistetraciclónico de ácido tetrasulfónico en las cicloadiciones de Diels-Alder.
  • Para lograr un control estructural sin precedentes en los polifenilenos sulfonados.

Principales métodos:

  • Síntesis de un nuevo monómero de bistetraciclo de ácido tetrasulfónico.
  • Utilizando la reacción de cicloadición de Diels-Alder [4 + 2] para la formación de polímeros.
  • Caracterización molecular de los oligfenilenos y polifenilenos resultantes.

Principales resultados:

  • Síntesis exitosa de oligo- y polifenilenos sulfonados estructuralmente definidos.
  • Demostración de la utilidad del monómero en la cicloadición de Diels-Alder.
  • La caracterización reveló una proporción de ~ 1: 1 de meta-meta y para-para aductos en los oligofenilenos.
  • Preparación de polifenilenos sulfonados esterilizados nuevos.

Conclusiones:

  • El nuevo monómero y el enfoque de Diels-Alder proporcionan una ruta versátil para los polifenilenos sulfonados controlados con precisión.
  • Esta metodología permite la creación de materiales avanzados con características estructurales a medida.
  • Los polímeros sintetizados tienen potencial para aplicaciones que requieren un alto rendimiento y funcionalidades específicas.