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Related Concept Videos

Radical Formation: Abstraction00:47

Radical Formation: Abstraction

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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...
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Radical Formation: Overview01:03

Radical Formation: Overview

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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...
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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 Formation: Homolysis00:54

Radical Formation: Homolysis

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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Radical Formation: Elimination00:51

Radical Formation: Elimination

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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...
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Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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Toward Indigenous Presence: A Radical Relationality Approach for Designing Mixed-Reality Indigenous Data Experiences.

Sean J Dorr, James W Rock, Vicente M Diaz

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    Summary

    Indigenous Presence is a design principle that makes computing tools responsive to Indigenous priorities by blending participatory design with Indigenous theory. This approach fosters ethical computing research and increases community participation.

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    Area of Science:

    • Computer Science
    • Human-Computer Interaction
    • Indigenous Studies

    Background:

    • Participatory design often lacks frameworks for deep community engagement.
    • Virtual and mixed-reality (MR) research requires culturally sensitive approaches.
    • Indigenous communities have unique priorities for technology development.

    Purpose of the Study:

    • To introduce Indigenous Presence, a design principle for co-designing computing tools with Indigenous communities.
    • To integrate Critical Indigenous Theory and MR presence theories into design.
    • To outline factors for activating Indigenous Presence in practice.

    Main Methods:

    • Blending participatory design with radical relationality and presence theories.
    • Developing the Indigenous Presence design principle.
    • Documenting a six-year partnership with Micronesian and Dakota communities using MR for cultural knowledge exchange.

    Main Results:

    • Identified five factors for activating Indigenous Presence: community-relevant topics, inclusion of Indigenous makers, culturally identifiable experiences, centering radical relationality, and respecting Indigenous protocols.
    • Demonstrated the application of Indigenous Presence in a long-term community partnership.
    • Showcased the use of MR for revitalizing and exchanging cultural knowledges.

    Conclusions:

    • Indigenous Presence offers a pathway for ethical and community-centered computing research.
    • This principle can enhance trustworthiness and participation in computing among Indigenous communities.
    • The approach supports the revitalization and exchange of Indigenous cultural knowledges through technology.