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Related Concept Videos

Radical Formation: Overview01:03

Radical Formation: Overview

A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the latter, also known...
Radical Formation: Abstraction00:47

Radical Formation: Abstraction

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...
Radical Formation: Addition00:47

Radical Formation: Addition

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 unpaired...
Radical Formation: Elimination00:51

Radical Formation: Elimination

Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions with respect to...
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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 molecule. These three...
Radicals01:27

Radicals

Roots, often written as radicals, identify the quantity that must be raised to a specific exponent to produce a given value. A radical expression consists of two main components: the radicand, which is the value placed inside the root symbol, and the index, which indicates the degree of the root being taken. The notation n√a indicates the principal nth root of a. If n equals 2, the operation is the square root, while n = 3 defines the cube root. When n is even, a negative radicand does not...

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Free Radicals in Chemical Biology: from Chemical Behavior to Biomarker Development
14:22

Free Radicals in Chemical Biology: from Chemical Behavior to Biomarker Development

Published on: April 15, 2013

A parallel between radical reductionism in science and in art.

Eric R Kandel1, Sarah Mack

  • 1Howard Hughes Medical Institute, Center for Neurobiology and Behavior, Columbia University College of Physicians Surgeons, New York, New York 10032, USA. Erk5@columbia.edu

Annals of the New York Academy of Sciences
|November 20, 2003
PubMed
Summary

Neural science connects physical world studies with human existence inquiries. It addresses philosophical questions about the mind and employs shared methodologies with the humanities.

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Area of Science:

  • Neuroscience
  • Philosophy of Mind
  • Interdisciplinary Studies

Background:

  • Neural science bridges natural sciences and humanities.
  • The brain is a key focus for understanding human existence.
  • Classical philosophy posed fundamental questions about the mind.

Purpose of the Study:

  • Illustrate the bridging function of neural science.
  • Demonstrate how neuroscience addresses humanistic questions.
  • Highlight shared methodologies between neuroscience and humanities.

Main Methods:

  • Examining neural science research on mind-related questions.
  • Analyzing philosophical inquiries into consciousness and cognition.
  • Identifying common research approaches in both fields.

Main Results:

  • Neural science tackles historically philosophical questions about the mind.
  • Specific instances show shared methodologies between neural science and humanities.
  • The brain's study informs understanding of human experience.

Conclusions:

  • Neural science serves as a crucial link between scientific and humanistic inquiry.
  • Interdisciplinary approaches enhance understanding of the mind and human existence.
  • Shared methodologies foster collaboration and deeper insights.