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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.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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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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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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Molecular Hydrogen Generation from Neat Formic Acid Catalyzed by Ruthenium-Cymene α‑Diimine Complexes.

Cássio R A do Prado1,2, Lucas da S Dos Santos1,2, Ellen C Guimarães1

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Ruthenium complexes with α-diimine ligands efficiently catalyze formic acid dehydrogenation, achieving high conversion and turnover frequencies. Ligand structure significantly impacts catalytic activity, with mechanistic studies revealing a chloride displacement pathway.

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Green Chemistry

Background:

  • Development of efficient catalysts for hydrogen production from formic acid is crucial for sustainable energy.
  • Ruthenium complexes are promising catalysts, but their activity and selectivity depend heavily on ligand design.
  • Understanding the structure-activity relationship and catalytic mechanisms is key to optimizing performance.

Purpose of the Study:

  • Synthesize and characterize novel half-sandwich ruthenium(II) complexes with substituted α-diimine ligands.
  • Evaluate the catalytic performance of these complexes in the solvent-free dehydrogenation of formic acid.
  • Investigate the influence of ligand electronic and steric properties on catalytic activity and explore the reaction mechanism.

Main Methods:

  • Synthesis of seven half-sandwich ruthenium(II) complexes with varying α-diimine ligands.
  • Comprehensive characterization using elemental analysis, NMR, FTIR, UV-vis spectroscopy, and X-ray diffraction.
  • Catalytic testing for formic acid dehydrogenation under mild, solvent-free conditions, coupled with DFT calculations and kinetic studies for mechanistic elucidation.

Main Results:

  • All synthesized ruthenium complexes demonstrated catalytic activity in formic acid dehydrogenation.
  • Complexes achieved up to 94.8% conversion and a maximum turnover frequency (TOF) of 627 h⁻¹ at 60 °C.
  • Catalytic performance was significantly influenced by the electronic and steric properties of the α-diimine ligands, with mechanistic studies supporting a chloride displacement-initiated pathway.

Conclusions:

  • The study successfully synthesized and characterized a series of ruthenium(II)-α-diimine complexes.
  • These complexes are effective precatalysts for formic acid dehydrogenation, showcasing high efficiency and recyclability.
  • Ligand modification offers a viable strategy to tune catalytic activity, and the proposed mechanism provides insights for future catalyst design.