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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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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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Theoretical study on hydroformylation catalyzed by cationic cobalt(II) complexes.

Shuo Zhang1, Zhewei Li1, Hexiang Qi1

  • 1State Key Laboratory of Chemical Resource Engineering, Institute of Computational Chemistry, College of Science, Beijing University of Chemical Technology, Beijing 100029, China. leim@mail.buct.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|March 25, 2024
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Summary

Density functional theory (DFT) investigated cobalt-catalyzed hydroformylation mechanisms. Heterolytic H2 activation is rate-determining, with linear aldehydes favored and catalyst activity enhanced by electron-rich ligands.

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Area of Science:

  • Homogeneous catalysis
  • Organometallic chemistry
  • Computational chemistry

Background:

  • Hydroformylation is a crucial industrial process.
  • Cationic cobalt(II) complexes are effective hydroformylation catalysts.
  • Understanding reaction mechanisms is key to catalyst optimization.

Purpose of the Study:

  • Investigate two proposed mechanisms for cobalt-catalyzed hydroformylation.
  • Determine the rate-determining step and energy barriers.
  • Analyze factors influencing regioselectivity and catalyst activity.

Main Methods:

  • Density functional theory (DFT) calculations.
  • Comparison of carbonyl dissociative and associative mechanisms.
  • Analysis of catalyst spin multiplicity and substituent effects.

Main Results:

  • Heterolytic H2 activation is the rate-determining step for both mechanisms.
  • Energy barriers for dissociative and associative mechanisms are 26.8 and 40.5 kcal mol-1, respectively.
  • The doublet state is the most stable for cobalt(II) catalysts, favoring linear aldehyde formation.
  • Increased electron density on the cobalt center, via ligand modification (e.g., P(tBu)2), enhances catalytic activity.

Conclusions:

  • DFT provides insights into cobalt-catalyzed hydroformylation pathways.
  • Catalyst design can be guided by computational studies to improve activity.
  • Optimized ligands can significantly lower energy barriers and enhance product selectivity.