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Radical Anti-Markovnikov Addition to Alkenes: Overview01:25

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The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
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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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The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
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Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
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Allyl radicals are three-carbon conjugated systems. They are readily formed as intermediates in halogenation reactions of alkenes involving the addition of halogen to the allylic carbon instead of the double bond. As seen in allyl cations and anions, each of the three sp2-hybridized carbon atoms in allyl radicals has an unhybridized p orbital. These orbitals combine to give three π molecular orbitals.
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Alternant Hydrocarbon Diradicals as Optically Addressable Molecular Qubits.

Yong Rui Poh1, Dmitry Morozov2, Nathanael P Kazmierczak3

  • 1Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States.

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Researchers developed metal-free molecular qubits using alternancy symmetry to create high-spin organic molecules. These "m-dimers" enable ground-state spin polarization for quantum information science and magnetic sensing applications.

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Area of Science:

  • Quantum Information Science
  • Molecular Magnetism
  • Organic Electronics

Background:

  • High-spin molecules are crucial for bottom-up qubit design and magnetic sensing.
  • Metal-free molecules offer cost and environmental advantages over transition-metal complexes.
  • Existing luminescent open-shell organic molecules often lack stable ground-state radical character for qubits.

Purpose of the Study:

  • To design metal-free molecular systems with high ground-state diradical character for qubit applications.
  • To explore the potential of alternancy symmetry in controlling radical-radical interactions.
  • To establish a pathway for optically addressable metal-free molecular qubits.

Main Methods:

  • Utilized alternancy symmetry to minimize ground-state radical-radical interactions.
  • Synthesized and analyzed meta-linked (m-dimer) π-systems.
  • Performed detailed electronic structure analysis of alternant hydrocarbon m-diradicals.

Main Results:

  • Achieved high diradical character in the ground state of m-dimers.
  • Identified specific symmetries in excited states of m-diradicals.
  • Demonstrated potential for ground-state spin polarization via optically detected magnetic resonance (ODMR).

Conclusions:

  • Alternant hydrocarbon m-diradicals are feasible platforms for metal-free molecular color centers.
  • The developed m-dimer strategy enables robust ground-state spin polarization for qubit applications.
  • This work paves the way for cost-effective and environmentally friendly quantum technologies.