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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 Reactivity: Electrophilic Radicals01:02

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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...
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Radical Formation: Addition00:47

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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.
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Radical Reactivity: Steric Effects01:10

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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 Reactivity: Overview01:11

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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 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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Related Experiment Video

Updated: Sep 17, 2025

Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology
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Will the embedded semantic radicals be activated when recognizing Chinese phonograms?

Meng Jiang1,2,3, Xueyao Pan4, Xia Wang1,2,3

  • 1College of Language Intelligence (College of General Education), Sichuan International Studies University, Chongqing, China.

Frontiers in Human Neuroscience
|June 30, 2025
PubMed
Summary
This summary is machine-generated.

Semantic radicals in Chinese characters activate automatically and remain effective for about 500 milliseconds. This sub-lexical semantic activation in Chinese phonogram recognition is automatic but transient, dissipating before 1000 ms.

Keywords:
Chinese charactersembedded semantic radicalfrequencyphonograms recognitionsub-lexical semantic activation

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Area of Science:

  • Cognitive Psychology
  • Linguistics
  • Neuroscience

Background:

  • Chinese characters often combine semantic and phonetic components.
  • Processing of these embedded radicals is crucial for character recognition.
  • The temporal dynamics of sub-lexical semantic activation remain unclear.

Purpose of the Study:

  • To investigate the automatic activation of semantic radicals within Chinese phonograms.
  • To determine the time course and duration of sub-lexical semantic activation.
  • To examine factors influencing this activation, including prime frequency and stimulus onset asynchrony (SOA).

Main Methods:

  • A priming character decision task with a between-subjects design was employed.
  • Semantic relatedness between embedded radicals and target characters was manipulated.
  • Stimulus onset asynchronies (SOAs) of 100 ms, 500 ms, and 1000 ms were used.

Main Results:

  • Facilitatory priming effects were observed at a 500 ms SOA for low-frequency primes.
  • No significant priming effects were detected at 100 ms or 1000 ms SOAs.
  • Prime frequency did not influence priming effects at the non-significant SOAs.

Conclusions:

  • Sub-lexical semantic activation occurs automatically and is robust at 500 ms.
  • This activation appears to dissipate before 1000 ms.
  • The findings provide evidence for the automaticity and temporal characteristics of processing embedded semantic radicals in Chinese characters.