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Ligand effects on Ni(II)-catalysed alkane-hydroxylation with m-CPBA
Takayuki Nagataki1, Kenta Ishii, Yoshimitsu Tachi
1Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan. shinobu@sci.osaka-cu.ac.jp
New nickel(II) complexes with pyridylalkylamine ligands were synthesized and tested for cyclohexane oxidation. Pyridylmethylamine ligands improved turnover, while pyridylethylamine ligands enhanced selectivity, with nitrate co-ligands causing initial reaction delays.
Area of Science:
- Coordination Chemistry
- Organometallic Chemistry
- Catalysis
Background:
- Nickel(II) complexes are versatile catalysts.
- Pyridylalkylamine ligands offer tunable steric and electronic properties.
- Oxidation of hydrocarbons is a key transformation in organic synthesis.
Purpose of the Study:
- Synthesize and characterize novel nickel(II) complexes with pyridylalkylamine ligands.
- Evaluate the catalytic activity of these complexes in cyclohexane oxidation.
- Investigate the influence of ligand structure and co-ligands on catalytic performance.
Main Methods:
- Synthesis of nickel(II) complexes with various pyridylalkylamine ligands.
- X-ray crystallographic analysis for structural characterization.
- Catalytic oxidation of cyclohexane using meta-chloroperoxybenzoic acid (m-CPBA).
Main Results:
- Mononuclear and one dinuclear nickel(II) complexes were structurally characterized.
- All complexes catalyzed cyclohexane oxidation, yielding cyclohexanol and cyclohexanone.
- Pyridylmethylamine ligands resulted in higher turnover numbers, while pyridylethylamine ligands offered better alcohol/ketone selectivity.
- Nitrate co-ligands introduced a lag phase in the catalytic reaction.
Conclusions:
- Ligand design significantly impacts the catalytic activity and selectivity of nickel(II) complexes in cyclohexane oxidation.
- Steric and electronic factors of pyridylalkylamine ligands play crucial roles.
- Co-ligand choice affects reaction kinetics, with nitrate anions potentially hindering initial catalysis.
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