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Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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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.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
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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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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Alkene Hydrobenzylation by a Single Catalyst That Mediates Iterative Outer-Sphere Steps.

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This study introduces a novel catalyst for cross-coupling reactions, utilizing outer-sphere mechanisms to efficiently link styrenes and benzyl bromides. This redox-neutral approach simplifies conditions and enables diverse alkene hydrobenzylation products.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Traditional cross-coupling reactions rely on inner-sphere elementary steps.
  • These methods often require specific conditions and can be limited in scope.

Purpose of the Study:

  • To develop a novel catalytic system for cross-coupling reactions.
  • To explore an alternative mechanism using outer-sphere interactions.
  • To achieve efficient and scalable synthesis of valuable organic compounds.

Main Methods:

  • Utilized a single catalyst system for cross-coupling reactions.
  • Employed iterative outer-sphere steps involving metal-ligand-carbon interactions.
  • Investigated the formation of stabilized radical intermediates.

Main Results:

  • Successfully cross-coupled styrenes and benzyl bromides.
  • Achieved predominant formation of heterocoupled products.
  • Demonstrated a redox-neutral system avoiding exogenous oxidants.
  • Enabled numerous variations of alkene hydrobenzylation, including quaternary carbon variants.

Conclusions:

  • The developed catalyst offers a simple, scalable, and versatile method for alkene hydrobenzylation.
  • The outer-sphere mechanism provides an alternative to traditional inner-sphere pathways.
  • The approach grants access to important structural motifs like heterodibenzyls.