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In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
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Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Photoactivated Pyridine Directed Fluorination through Hydrogen Atom Transfer.

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Hydrogen atom transfer (HAT) drives photopromoted fluorination of pyridylic groups. The pyridine nitrogen directs this reaction, enabling selective ortho-fluorination with minimal byproducts.

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Fluorination Reactions

Background:

  • Directed C-H functionalization is crucial in organic synthesis.
  • Photoredox catalysis offers novel reaction pathways.
  • Selective fluorination of heterocyclic compounds remains challenging.

Purpose of the Study:

  • To establish hydrogen atom transfer (HAT) as the key mechanism in a novel directed fluorination reaction.
  • To investigate the directing ability of the pyridyl nitrogen in photopromoted fluorination.
  • To explore the regioselectivity and scope of this new synthetic method.

Main Methods:

  • Utilized photoredox catalysis to initiate the reaction.
  • Employed Selectfluor as the fluorinating agent.
  • Investigated a range of pyridine and quinoline substrates.
  • Performed experimental and computational analyses to elucidate the mechanism.

Main Results:

  • Demonstrated that HAT is the primary mechanism in the directed fluorination of pyridylic groups.
  • Achieved highly regioselective fluorination at the ortho position, directed by the pyridyl nitrogen.
  • Showcased the reaction's efficacy with diverse pyridine and quinoline derivatives.
  • Observed minimal side product formation, indicating high selectivity.

Conclusions:

  • The Lewis basic pyridyl nitrogen effectively directs amine radical dication propagated HAT.
  • This method provides a powerful and selective route for ortho-fluorination of pyridines and quinolines.
  • The findings offer a mechanistic understanding that complements and expands upon existing fluorination strategies.