Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.4K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.2K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.2K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.6K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.6K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.8K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.8K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.0K
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...
2.0K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
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.
2.0K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Revealing Metal-Node-Dependent Intralayer Conjugation and Thickness-Dependent Interlayer Interactions in Photoconductive MOFs.

The journal of physical chemistry letters·2026
Same author

An autonomous lab for data-driven homogeneous catalysis.

Nature communications·2026
Same author

Operando Spectroscopic Analysis of Photovoltage Generation in Hematite Photoanodes.

Journal of the American Chemical Society·2026
Same author

Resilient nanostructured bioanalytic microneedle longitudinally monitors preclinical renal and hepatic drug clearance and dysfunction.

Science translational medicine·2026
Same author

Investigating the Adsorption-Desorption Kinetics of a Molecular Water Oxidation Catalyst at an Electrode Interface.

The journal of physical chemistry letters·2026
Same author

Sculpting Microbial Microenvironments: Spatiotemporal Control via Programmable Electrochemical Gradients.

Journal of the American Chemical Society·2026
Same journal

A Lithium Superionic Conductor Softened by Nonmetal-Chlorine Chemical Bonds.

Journal of the American Chemical Society·2026
Same journal

A Ferrocene Metal-Ligand Triplet Diradical with a Terminal Iminyl Group Discovered by Time-Resolved Mid-Infrared Spectroscopy.

Journal of the American Chemical Society·2026
Same journal

Regulating Li-Ion Transport via Solvent and Ion Clustering Using Ternary Salts in Nonfluorinated Solvents for Extended Cyclability of Zero-Excess Lithium-Metal Batteries.

Journal of the American Chemical Society·2026
Same journal

Terahertz-Field-Induced Dissociation of Frenkel Excitons in Organic Semiconductors.

Journal of the American Chemical Society·2026
Same journal

Interplay between Slow Chirality Inversion and Slow Guest Uptake in a Triple-Helical Closed-Cage Metallocryptand.

Journal of the American Chemical Society·2026
Same journal

Controlled Sulfane Sulfur Delivery via Allyl Disulfide Rearrangement-Mediated Thiosulfoxide Formation.

Journal of the American Chemical Society·2026
Ver todos los artículos relacionados

Video Experimental Relacionado

Updated: May 31, 2025

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture
09:53

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture

Published on: May 13, 2018

8.3K

El uso de clasificadores para predecir el diseño del catalizador para la microestructura de policetona

Yin-Pok Wong1, Hyuk-Joon Jung1, Shiyun Lin1

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States.

Journal of the American Chemical Society
|January 23, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo método clasificador para descubrir catalizadores de paladio para crear policetones no alternos. Este método identificó dos nuevas clases de catalizadores, mejorando la síntesis de polímeros y duplicando los tipos de catalizadores conocidos.

Más Videos Relacionados

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

7.8K
HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
11:15

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

Published on: July 23, 2016

10.2K

Videos de Experimentos Relacionados

Last Updated: May 31, 2025

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture
09:53

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture

Published on: May 13, 2018

8.3K
Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

7.8K
HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
11:15

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

Published on: July 23, 2016

10.2K

Área de la Ciencia:

  • Química de los polímeros
  • Ciencias de la catálisis

Sus antecedentes:

  • Los policetones no alternos se sintetizan mediante la copolimización del monóxido de carbono (CO) y el etileno.
  • Los catalizadores actuales de paladio para este proceso son limitados, utilizando principalmente sulfonato de fosfina y ligandos de monóxido de difosfano.

Objetivo del estudio:

  • Desarrollar un método predictivo de clasificación para el descubrimiento de nuevos catalizadores de paladio.
  • Ampliar la gama de catalizadores capaces de sintetizar policetones no alternos con contenido de CO controlado.

Principales métodos:

  • Aplicación de un método de clasificación para predecir el rendimiento del catalizador de paladio.
  • Selección e identificación de nuevos complejos de paladio para la copolimerización de CO/etileno.

Principales resultados:

  • Descubrimiento de dos nuevas clases de complejos de paladio para la síntesis de policetona no alternada.
  • Se ha logrado la síntesis de policetonas con un contenido de CO inferior al de los catalizadores existentes.
  • Dobló las clases conocidas de compuestos de paladio que pueden catalizar esta polimerización.

Conclusiones:

  • La metodología de clasificación desarrollada acelera el descubrimiento de catalizadores para la síntesis selectiva de polímeros.
  • Este enfoque amplía el alcance de los catalizadores de paladio para la producción de policetona sin alternancia.
  • La metodología tiene potencial para aplicaciones más amplias en el descubrimiento de catalizadores donde la selectividad es clave.