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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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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.
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HAT Lessons Help Hydrogen Hop, Skip, and Jump.

Sarah R Buzsaki1,2, Kang-Jie Bian1,2, Julian G West1

  • 1Department of Chemistry, Rice University, Houston, TX 77005, USA.

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Summary

Nagib and Rajanbabu developed a novel remote desaturation method using metal-catalyzed hydrogen atom transfer (mHAT) and intramolecular hydrogen atom transfer (HAT). This approach offers valuable synthetic strategies and insights for designing future HAT-mediated reactions.

Keywords:
CatalysisC–H FunctionalizationHydrogen Atom TransferRadicalRemote Functionalizationdesaturation

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Reaction Mechanisms

Background:

  • Hydrogen atom transfer (HAT) is a fundamental reaction pathway in organic chemistry.
  • Designing selective and efficient HAT reactions remains a key challenge in synthetic chemistry.
  • Remote functionalization strategies are crucial for complex molecule synthesis.

Purpose of the Study:

  • To introduce a novel remote desaturation method.
  • To explore the application of metal-catalyzed hydrogen atom transfer (mHAT) in a cascade reaction.
  • To provide insights into the design principles of HAT-mediated transformations.

Main Methods:

  • Utilized metal-catalyzed hydrogen atom transfer (mHAT) to initiate the reaction cascade.
  • Employed an intramolecular 1,6-hydrogen atom transfer (HAT) for regioselective functionalization.
  • Achieved reaction termination through a subsequent mHAT step.

Main Results:

  • Successfully demonstrated a remote desaturation of alkenes.
  • The developed method offers a valuable synthetic transformation.
  • The reaction pathway provides mechanistic insights into mHAT and intramolecular HAT processes.

Conclusions:

  • The presented method offers a clever and efficient approach to remote desaturation.
  • This work provides valuable lessons for the rational design of future HAT-mediated reactions.
  • The strategy highlights the potential of combining mHAT and intramolecular HAT for complex synthesis.