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Videos de Conceptos Relacionados

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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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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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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Metallaciclos Ru-Catenados Funcionalizados por Pireno: Conversión del Sistema Catenado al Monorrectángulo a través

Gajendra Gupta1, Junseong Lee2, Rizky Hadiputra3

  • 1Department of Energy and Chemical Engineering/Innovation Center for Chemical Engineering, Incheon National University, Yeonsu-gu, Incheon 22012, Republic of Korea.

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Hemos sintetizado nuevos rectángulos encadenados de rutenio y pireno. Estas estructuras se transforman espontáneamente en monorrectángulos en nitrometano a temperatura ambiente, ofreciendo nuevas ideas sobre el autoensamblaje molecular.

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Área de la Ciencia:

  • Química supramolecular
  • Ciencias de los materiales
  • Química computacional

Sus antecedentes:

  • Las arquitecturas moleculares mecánicamente entrelazadas a menudo requieren estímulos químicos para las transformaciones estructurales.
  • Comprender las vías de autoensamblaje es crucial para diseñar sistemas moleculares complejos.

Objetivo del estudio:

  • Para sintetizar nuevos rectángulos en cadena basados en rutenio y pireno.
  • Investigar la conversión estructural espontánea de estos rectángulos encadenados en monorrectángulos.
  • Elucidar las fuerzas motrices termodinámicas para la formación de estructuras en cadena mediante cálculos teóricos.

Principales métodos:

  • Síntesis de rectángulos encadenados (2+2) 2 utilizando bloques de construcción de rutenio y pireno.
  • Análisis estructural dependiente del disolvente y de la concentración de los sistemas en cadena.
  • Teoría funcional de la densidad (DFT) y cálculos de GFN2-xTB para determinar las energías de unión y las preferencias de formación.

Principales resultados:

  • Síntesis exitosa de rectángulos encadenados basados en rutenio y pireno (2+2) 2.
  • Observación de la transformación espontánea en monorrectángulos en nitrometano a temperatura ambiente sin manipulación química externa.
  • Los cálculos teóricos confirmaron que las estructuras en cadena exhiben energías de unión más bajas, favoreciendo su formación sobre las estructuras de anillo en anillo o Borromean.

Conclusiones:

  • Los rectángulos encadenados sintetizados representan una nueva clase de estructuras entrelazadas.
  • La transformación espontánea en monorrectángulos en el nitrometano destaca un comportamiento molecular único y libre de estímulos.
  • Las ideas computacionales validan la preferencia termodinámica para el ensamblaje en cadena en este sistema.