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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Introduction
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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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C-H activation/functionalization catalyzed by simple, well-defined low-valent cobalt complexes.

Brendan J Fallon1, Etienne Derat, Muriel Amatore

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|January 28, 2015
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Low-valent cobalt catalysts enable facile C-H activation and functionalization of aromatic imines. This study presents an efficient protocol for anti-selective C-H/hydroarylation of alkynes, elucidating cobalt-catalyzed C-H functionalization mechanisms.

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Area of Science:

  • Organic Chemistry
  • Organometallic Chemistry
  • Catalysis

Background:

  • C-H activation and functionalization are crucial for organic synthesis.
  • Cobalt catalysis offers a cost-effective alternative to precious metals.
  • The mechanisms of cobalt-catalyzed C-H functionalization remain largely unexplored.

Purpose of the Study:

  • To develop a facile method for C-H activation and functionalization of aromatic imines.
  • To establish an efficient protocol for the anti-selective C-H/hydroarylation of alkynes using cobalt catalysts.
  • To elucidate the mechanism of cobalt-catalyzed C-H functionalization.

Main Methods:

  • Utilized low-valent cobalt catalysts, specifically Co(PMe3)4.
  • Developed a protocol for C-H/hydroarylation of alkynes with aromatic imines.
  • Employed deuterium-labeling experiments and Density Functional Theory (DFT) calculations.

Main Results:

  • Achieved facile C-H activation and functionalization of aromatic imines.
  • Developed an efficient and simple protocol for anti-selective C-H/hydroarylation of alkynes.
  • Provided mechanistic insights into cobalt-catalyzed C-H functionalization.

Conclusions:

  • Low-valent cobalt catalysts are effective for C-H activation and functionalization of aromatic imines.
  • The developed protocol offers an efficient route for anti-selective hydroarylation of alkynes.
  • Mechanistic studies have illuminated the previously elusive pathway of cobalt-catalyzed C-H functionalization.