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Chemical Reactions01:19

Chemical Reactions

A chemical reaction is a process by which the bonds in the atoms of substances are rearranged to generate new substances. Matter cannot be created or destroyed in a chemical reaction—the same type and number of atoms that make up the reactants are still present in the products. Merely, the rearrangement of chemical bonds produces new compounds.
Chemical Reactions Rearrange Atoms into New Substances
A chemical reaction takes starting materials—the reactants—and changes them into different...
Chemical Reactions02:26

Chemical Reactions

A balanced chemical equation provides the information of chemical formulas of the reactants and products involved in the chemical change. A reaction’s stoichiometry helps predict how much of the reactant is needed to produce the desired amount of product, or in some cases, how much product will be formed from a specific amount of the reactant.
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in...
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Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
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Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
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A Single-Component System

In the field of chemistry, the terms "component" and "phase" hold significant importance. A component refers to a chemically distinct substance in a system that has specific properties. It is chemically homogeneous, meaning it has the same properties throughout. For example, in a mixture of salt and water, both salt and water are considered separate components because they have different chemical properties.On the other hand, a phase is a form of matter that has a consistent chemical...
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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...

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Reacciones en cascada de plasma y microgotas programables para sistemas multicomponentes

Alexander J Grooms1, Isabella M Marcelo1, Robert T Huttner1

  • 1Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States.

Journal of the American Chemical Society
|October 28, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio introduce reacciones en cascada programables en microgotas cargadas utilizando especies reactivas de oxígeno (ROS) generadas por plasma para la formación eficiente de enlaces carbono-carbono. El nuevo enfoque acelera las reacciones y permite la síntesis selectiva, ofreciendo un método ecológico para la producción química.

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Área de la Ciencia:

  • Química ecológica
  • Química orgánica sintética
  • Química del plasma

Sus antecedentes:

  • La síntesis tradicional a menudo requiere condiciones duras y catalizadores.
  • Las reacciones de microgotas ofrecen entornos únicos para las transformaciones químicas.
  • El plasma no térmico es una fuente de especies reactivas para la síntesis química.

Objetivo del estudio:

  • Desarrollar una plataforma de reacción en cascada programable en microgotas cargadas.
  • Utilización de especies reactivas de oxígeno (ROS) generadas in situ para la formación acelerada de enlaces C-C no catalizados.
  • Demostrar la selectividad del producto y las capacidades de síntesis a escala preparativa.

Principales métodos:

  • Fusión de ROS generados por plasma no térmico con microgotas de agua cargadas por pulverización coaxial.
  • Generación en tiempo real y entrega de ROS en microgotas.
  • Estudio de tres niveles: adición de Michael, nueva formación de enlaces C-C y reacciones en cascada de Hantzsch.

Principales resultados:

  • Se obtienen factores de mejora de la reacción >10^3 en comparación con las reacciones de solo microgotas.
  • Habilitado adiciones de Michael no catalizadas y reacciones de Hantzsch con alta selectividad.
  • Se ha demostrado la formación de aniones enolados a través de la abstracción de hidrógeno por ROS, evitando bases fuertes.
  • Se ha facilitado la formación de nuevos enlaces C-C utilizando sustratos proelectrófilos activados.
  • Cantidades de productos recogidas en miligramos, indicando la viabilidad a escala preparativa.

Conclusiones:

  • La fusión de plasma y microgotas es una plataforma efectiva para reacciones en cascada programables.
  • El método proporciona una ruta sintética verde para la formación de enlaces C-C no catalizados.
  • La plataforma ofrece control sobre la selección del producto y evita reacciones secundarias no deseadas.