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Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
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Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
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Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the...
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Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
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Kirigami de grafeno y sus derivados

Melina K Blees1, Arthur W Barnard2, Peter A Rose1

  • 1Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.

Nature
|July 30, 2015
PubMed
Resumen
Este resumen es generado por máquina.

El grafeno se puede cortar y doblar (kirigami) en estructuras a microescala con propiedades mecánicas ajustables. Las ondas en las láminas de grafeno aumentan significativamente la rigidez, lo que permite aplicaciones en dispositivos micro-mecánicos.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Ingeniería mecánica
  • Nanotecnología

Sus antecedentes:

  • El origami y el kirigami son artes tradicionales de plegado y corte de papel, adaptadas para crear estructuras en 3D.
  • Estas técnicas se están explorando para fabricar estructuras a microescala a partir de materiales 2D avanzados.

Objetivo del estudio:

  • Investigar la idoneidad del grafeno para el kirigami a escala microscópica.
  • Para entender las propiedades mecánicas de las estructuras de grafeno con patrones de kirigami.

Principales métodos:

  • El kirigami de grafeno se realizó en hojas de grafeno monocapa (10-100 micrómetros).
  • El número de Föppl-von Kármán (γ) se determinó midiendo la rigidez de flexión.
  • Se utilizaron imágenes interferométricas para analizar la estructura de la membrana e identificar ondulaciones.

Principales resultados:

  • El grafeno es muy adecuado para el kirigami, lo que permite la creación de estructuras robustas a microescala.
  • La rigidez de flexión medida del grafeno fue miles de veces mayor de lo previsto, debido a las ondas.
  • El número de Föppl-von Kármán (γ) del grafeno ondulado es comparable al papel, lo que indica la facilidad de flexión.
  • El grafeno con patrón de Kirigami exhibe propiedades mecánicas ajustables.

Conclusiones:

  • El kirigami de grafeno es un método viable para la fabricación de metamateriales mecánicos a microescala.
  • Las ondas en el grafeno aumentan significativamente su rigidez de flexión, haciéndolo adecuado para el kirigami.
  • Este enfoque permite la creación de componentes resistentes y móviles a microescala como resortes y bisagras.