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Videos de Conceptos Relacionados

Benzene to Phenol via Cumene: Hock Process01:27

Benzene to Phenol via Cumene: Hock Process

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The synthesis of phenol from benzene via cumene and cumene hydroperoxide is called the Hock process. First, a Friedel–Crafts alkylation reaction of benzene with propene gives cumene. Then cumene forms cumene hydroperoxide via a radical chain reaction. In the chain initiation step, the benzylic hydrogen is abstracted to give a benzylic radical. In the chain propagation step, the benzylic radical reacts with an oxygen diradical to form a cumene hydroperoxide radical. The cumene...
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Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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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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Alcohols are organic compounds in which a hydroxy group is attached to a saturated carbon. Phenols are a class of alcohols containing a hydroxy group attached to an aromatic ring. The physical properties of the alcohols and phenols are influenced by hydrogen bonding due to the oxygen–hydrogen dipole in the hydroxy functional group and dispersion forces between alkyl or aryl regions of alcohol and phenol molecules.
Alcohols possess a higher boiling point than aliphatic hydrocarbons of...
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Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils
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¿Se puede utilizar el proceso de Hock para producir fenol a partir del poliestireno?

Doohyun Baek1,2, Abdullah J Al Abdulghani3, Dylan J Walsh1,2

  • 1Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.

Journal of the American Chemical Society
|February 26, 2025
PubMed
Resumen

Los investigadores exploraron la conversión del poliestireno residual (PS) en fenol utilizando un proceso Hock modificado. Los anillos fenilo vecinos en PS impiden la reacción, lo que resulta en rendimientos de fenol más bajos en comparación con las moléculas pequeñas.

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Área de la Ciencia:

  • Química de los polímeros
  • Ingeniería Química
  • Materiales sostenibles

Sus antecedentes:

  • El poliestireno (PS) tiene una baja tasa de reciclaje, lo que requiere estrategias de conversión química.
  • Los métodos de oxidación actuales para el PS producen ácido benzoico, un producto de baja demanda.
  • El fenol es un producto químico de gran volumen, pero la conversión directa del PS no se logra.

Objetivo del estudio:

  • Investigar la adaptación del proceso de Hock para convertir el poliestireno residual en fenol.
  • Comprender la reactividad química del poliestireno bajo las condiciones del proceso de Hock.
  • Identificar los desafíos y las perspectivas para la conversión de polímeros a productos químicos.

Principales métodos:

  • Autoxidación de enlaces bencílicos C-H en compuestos modelo de PS y PS para formar hidroperoxidos.
  • Reorganización promovida por el ácido de los hidroperoxidos para producir fenol.
  • Estudios experimentales y computacionales en modelos diméricos y triméricos de PS.
  • Análisis de las restricciones conformacionales que afectan a la transferencia de átomos de hidrógeno.

Principales resultados:

  • El proceso de Hock se adaptó al poliestireno, produciendo fenol y un polímero oxigenado.
  • Los anillos fenilo vecinos en PS imponen restricciones conformacionales, aumentando la barrera a la transferencia de átomos de hidrógeno.
  • Estos efectos estéricos reducen los rendimientos de fenol del poliestireno en comparación con las materias primas de moléculas pequeñas.

Conclusiones:

  • La adaptación de procesos de moléculas pequeñas como el proceso de Hock a los polímeros presenta desafíos únicos debido a la estructura macromolecular.
  • La comprensión de la reactividad específica del polímero es crucial para desarrollar métodos eficientes de reciclaje químico.
  • Los hallazgos ofrecen ideas para convertir otros polímeros en productos químicos valiosos.