A cobalt(II) complex with anionic and neutral N-donor ligands: synthesis, crystal structure, and application as a heterogeneous catalyst for olefin epoxidation with tert-BuOOH

作者：Tabrizi Leila; Chiniforoshan Hossein^*; Mcardle Patrick

来源：Journal of Coordination Chemistry, 2015, 68(6): 980-992.

DOI：10.1080/00958972.2015.1007964

• Heterogeneous catalysis
• tert-BuOOH
• Mefenamic acid
• Epoxidation
• Cobalt(II)

A cobalt(II) complex containing deprotonated mefenamic acid (Hmef) and imidazole (HIm), [Co(mef)(2)(HIm)(2)(CH3OH)(2)], has been synthesized and characterized by spectroscopic techniques (UV-vis, IR, and EPR), elemental analysis, and single-crystal X-ray diffraction analysis. The structure has distorted octahedral geometry around cobalt. The mefenamate is a monodentate ligand coordinated to the Co(II) through a carboxylate oxygen. This complex was tested as a catalyst for epoxidation of alkenes with tert-BuOOH in 1,2-dichloroethane solution. This catalyst was effective in epoxidation of various alkenes including non-activated terminal alkenes. The effects of solvent, oxidant, and temperature on the epoxidation of cyclohexene were investigated. In all cases, high yields of epoxidized alkenes were obtained.

• 出版日期2015