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Related Concept Videos

Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
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Radical Halogenation: Stereochemistry01:33

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Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:
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Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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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...
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Radical Formation: Addition00:47

Radical Formation: Addition

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Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
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Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

2.6K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
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Radical Substitution: Allylic Chlorination01:31

Radical Substitution: Allylic Chlorination

3.3K
Typically, when alkenes react with halogens at low temperatures, an addition reaction occurs. However, upon increasing the temperature or under reaction conditions that form radicals, providing a low but steady concentration of halogen radicals, allylic substitution reaction is favored. This is because allylic hydrogens are very reactive as the formed intermediate is resonance stabilized. For example, when propene is treated with chlorine in the gas phase at 400 °C, it undergoes allylic...
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Related Experiment Video

Updated: Mar 5, 2026

Digital Handwriting Analysis of Characters in Chinese Patients with Mild Cognitive Impairment
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The Inversion Effect for Chinese Characters is Modulated by Radical Organization.

Canhuang Luo1,2,3, Wei Chen4, Ye Zhang5,6,7

  • 1Institutes of Psychological Sciences, Hangzhou Normal University, Hangzhou, Zhejiang, China.

Journal of Psycholinguistic Research
|March 29, 2017
PubMed
Summary

Chinese character recognition involves configural processing, influenced by radical structure familiarity. The magnitude of the inversion effect in visual object recognition varied with radical structure, being largest for familiar left-right structures.

Keywords:
Character structureChinese characterConfigural processingInversion effect

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Neuroscience

Background:

  • Visual object recognition expertise is linked to configural processing and inversion effects.
  • Chinese literacy confers orthographic sensitivity, potentially involving configural processing for character recognition.
  • Chinese character recognition is hypothesized to involve hierarchical processing of strokes and radicals, organized into structures like left-right or top-bottom.

Purpose of the Study:

  • To investigate the impact of radical-structure hierarchical level and familiarity on the inversion effect in Chinese character recognition.
  • To determine if specific structural properties of Chinese characters influence configural processing during recognition.

Main Methods:

  • Participants performed a matching task on pairs of upright and inverted Chinese characters.
  • Characters varied across different radical structures (left-right, top-bottom, simple).
  • Inversion effects were quantified using reaction time and response sensitivity.

Main Results:

  • An inversion effect was observed across all tested radical structures.
  • The magnitude of the inversion effect differed significantly based on radical structure.
  • The largest inversion effect was found for familiar left-right organized structures.

Conclusions:

  • Chinese character recognition engages both configural structure extraction and radical processing.
  • Familiarity and hierarchical level of radical structures modulate the configural processing involved in character recognition.
  • These findings highlight the distinct roles of structural properties in processing compound versus simple Chinese characters.