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Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Mass Spectrometry: Molecular Fragmentation Overview01:20

Mass Spectrometry: Molecular Fragmentation Overview

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The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
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Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

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The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable,...
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Dendrímeros de ruptura heterogéneos

Oliver C J Andrén1, Aristi P Fernandes2, Michael Malkoch1

  • 1School of Chemical Science and Engineering, Fiber and Polymer Technology, KTH Royal Institute of Technology , Teknikringen 56-58, SE-100 44 Stockholm, Sweden.

Journal of the American Chemical Society
|November 11, 2017
PubMed
Resumen
Este resumen es generado por máquina.

Los dendrímeros con enlaces disulfuro fueron diseñados para descomponerse en tiolos dentro de las células cancerosas. Esta fragmentación aumentó las especies reactivas de oxígeno (ROS), ofreciendo una nueva estrategia para el tratamiento del cáncer.

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Área de la Ciencia:

  • Química supramolecular
  • Nanotecnología
  • Química medicinal

Sus antecedentes:

  • Los andamios macromoleculares pueden modelar la síntesis de nuevas moléculas pequeñas.
  • Los dendrímeros ofrecen propiedades estructurales únicas para la liberación molecular controlada.

Objetivo del estudio:

  • Para sintetizar dendrímeros con enlaces internos de disulfuro como plantillas macromoleculares.
  • Para demostrar el desmontaje selectivo de estos dendrímeros en los tiolos constituyentes.
  • Evaluar el potencial de fragmentación de dendrimeros para la generación de especies reactivas de oxígeno (ROS) intracelulares en células cancerosas.

Principales métodos:

  • Síntesis de dendrímeros con puentes de disulfuro.
  • Desmontaje sensible a los estímulos mediante el uso de DTT.
  • Evaluación intracelular de los niveles de ROS en las células humanas de carcinoma pulmonar A549.

Principales resultados:

  • Los dendrímeros se desmontaron con éxito en componentes de tiol definidos (C3, CD2, DB2) bajo condiciones de reducción.
  • La fragmentación del dendrimero condujo a un aumento significativo de los niveles intracelulares de ROS en las células A549.
  • Se confirmó la naturaleza ortogonal de la funcionalidad de DB2.

Conclusiones:

  • Los dendrímeros con puentes de disulfuro pueden actuar como plantillas macromoleculares impecables.
  • El desmontaje de dendrímeros intracelulares puede interrumpir el equilibrio redox celular al aumentar las ROS.
  • Estos hallazgos posicionan a los dendrímeros como potenciales prodrogas para la terapia del cáncer mediada por ROS.