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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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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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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions
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Palladium-catalysed alkene chain-running isomerization.

Andrew L Kocen1, Maurice Brookhart, Olafs Daugulis

  • 1Department of Chemistry, University of Houston, Houston, TX 77204-5003, USA. olafs@uh.edu.

Chemical Communications (Cambridge, England)
|August 25, 2017
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Summary
This summary is machine-generated.

This study introduces a palladium-catalyzed method for alkene isomerization, efficiently converting olefins to their most stable isomers. The process is effective even with low catalyst loading and is compatible with fluorinated compounds.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Isomerization Reactions

Background:

  • Alkene isomerization is crucial for synthesizing more stable olefin isomers.
  • Developing efficient and selective catalytic methods for isomerization remains an active area of research.

Purpose of the Study:

  • To report a novel palladium-catalyzed chain-running isomerization method for alkenes.
  • To demonstrate the synthesis of silyl enol ethers and fluoroenolates using this method.

Main Methods:

  • Utilized an air-stable 2,9-dimethylphenanthroline-palladium catalyst.
  • Employed NaBAr4 as a promoter for the isomerization reaction.
  • Conducted reactions at temperatures ranging from -30 to 20 °C.

Main Results:

  • Achieved efficient conversion of terminal and internal alkenes to their most stable double bond isomers.
  • Successfully synthesized silyl enol ethers from silylated allylic alcohols.
  • Demonstrated compatibility with fluorinated substituents, enabling fluoroenolate synthesis.
  • Showcased the method's efficiency with catalyst loadings as low as 0.05% on a gram scale.

Conclusions:

  • The developed palladium-catalyzed method offers a robust approach for alkene isomerization.
  • The reaction is versatile, accommodating various substrates including fluorinated compounds.
  • Low catalyst loading and mild conditions make this method practical for synthetic applications.