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

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

2.5K
Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
2.5K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.1K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.1K
Radical Formation: Abstraction00:47

Radical Formation: Abstraction

3.3K
The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
3.3K
Regioselectivity of Electrophilic Additions-Peroxide Effect02:35

Regioselectivity of Electrophilic Additions-Peroxide Effect

8.5K
In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
8.5K
Radical Anti-Markovnikov Addition to Alkenes: Overview01:25

Radical Anti-Markovnikov Addition to Alkenes: Overview

3.2K
The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
3.2K
Radical Reactivity: Electrophilic Radicals01:02

Radical Reactivity: Electrophilic Radicals

1.6K
Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
1.6K

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

A practical definition of conduction block in IvIg responsive multifocal motor neuropathy.

Journal of neurology, neurosurgery, and psychiatry·2005
Same author

Zero-bias anomaly and kondo-assisted quasiballistic 2D transport.

Physical review letters·2005
Same author

Alteration of blood pressure among the donors in a blood donation camp.

Mymensingh medical journal : MMJ·2005
Same author

Dynamics of lithium ions in calcium bismuthate glasses.

The Journal of chemical physics·2005
Same author

Complete substitution of cyclophosphamide by fludarabine and ATG in a busulfan-based preparative regimen for children and adolescents with beta-thalassemia.

Bone marrow transplantation·2005
Same author

Radioactivity studies along fracture zones in areas around Galudih, East Singhbhum, Jharkhand, India.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2005

Video Experimental Relacionado

Updated: Apr 24, 2026

An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation
08:36

An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation

Published on: November 3, 2016

11.7K

Evidencia observacional de la paridad entre radicales hidroxilo y radicales interhemisféricos.

P K Patra1, M C Krol2, S A Montzka3

  • 11] Department of Environmental Geochemical Cycle Research, JAMSTEC, Yokohama 236 0001, Japan [2] CAOS, Graduate School of Studies, Tohoku University, Sendai 980 8578, Japan.

Nature
|September 12, 2014
PubMed
Resumen

La proporción de radicales hidroxilo (OH) entre los hemisferios norte y sur es crucial para estimar las emisiones de gases de efecto invernadero. Este estudio estima que esta relación es de 0,97 ± 0,12, lo que sugiere que algunas estimaciones de emisiones pueden ser demasiado altas.

Más Videos Relacionados

Laser-free Hydroxyl Radical Protein Footprinting to Perform Higher Order Structural Analysis of Proteins
09:59

Laser-free Hydroxyl Radical Protein Footprinting to Perform Higher Order Structural Analysis of Proteins

Published on: June 4, 2021

3.0K
Monitoring Equilibrium Changes in RNA Structure by 'Peroxidative' and 'Oxidative' Hydroxyl Radical Footprinting
13:41

Monitoring Equilibrium Changes in RNA Structure by 'Peroxidative' and 'Oxidative' Hydroxyl Radical Footprinting

Published on: October 17, 2011

13.5K

Videos de Experimentos Relacionados

Last Updated: Apr 24, 2026

An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation
08:36

An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation

Published on: November 3, 2016

11.7K
Laser-free Hydroxyl Radical Protein Footprinting to Perform Higher Order Structural Analysis of Proteins
09:59

Laser-free Hydroxyl Radical Protein Footprinting to Perform Higher Order Structural Analysis of Proteins

Published on: June 4, 2021

3.0K
Monitoring Equilibrium Changes in RNA Structure by 'Peroxidative' and 'Oxidative' Hydroxyl Radical Footprinting
13:41

Monitoring Equilibrium Changes in RNA Structure by 'Peroxidative' and 'Oxidative' Hydroxyl Radical Footprinting

Published on: October 17, 2011

13.5K

Área de la Ciencia:

  • Química de la atmósfera química de la atmósfera
  • Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
  • Monitoreo del medio ambiente El monitoreo del medio ambiente.

Sus antecedentes:

  • El radical hidroxilo (OH) es un oxidante atmosférico primario que controla la vida útil de muchos contaminantes y gases de efecto invernadero.
  • La relación de las concentraciones de OH entre el hemisferio norte (NH) y el hemisferio sur (SH) es crítica para estimar con precisión las emisiones de especies como el metano y los óxidos de nitrógeno.
  • Las estimaciones existentes para la relación NH/SH OH varían ampliamente, lo que indica una importante brecha de conocimiento.

Objetivo del estudio:

  • Para determinar una relación NH/SH más precisa de las concentraciones de radicales hidroxilo (OH).
  • Para refinar la comprensión del transporte interhemisférico y su influencia en la distribución de oxidantes atmosféricos.
  • Evaluar las implicaciones de la relación NH/SH OH para los inventarios de emisiones de arriba hacia abajo.

Principales métodos:

  • Se utilizaron datos de metilcloroformo como un sustituto para las concentraciones de OH.
  • Empleado un modelo de transporte atmosférico para simular el transporte y las emisiones interhemisféricas.
  • Las emisiones globales optimizadas y la abundancia media de OH coinciden con las mediciones de metilcloroformo de las redes de superficie y de aeronaves.

Principales resultados:

  • Se estableció una relación lineal entre el gradiente NH-SH modelado del metilcloroformo y la relación NH/SH OH modelada.
  • Se estima que la relación NH/SH OH es de 0,97 ± 0,12 para el período 2004-2011.
  • Se ha demostrado que los datos de metilcloroformo pueden limitar efectivamente la relación NH/SH OH.

Conclusiones:

  • El estudio proporciona una estimación restringida para la relación NH/SH OH, mejorando nuestra comprensión de la distribución de oxidantes atmosféricos.
  • Los hallazgos sugieren que las estimaciones de emisiones de arriba hacia abajo para los óxidos de nitrógeno en el NH, que se basan en relaciones NH / SH OH > 1, podrían ser sobreestimadas.
  • Esta investigación pone de relieve la importancia de una distribución precisa de OH para cálculos fiables de las emisiones.