Reusable manganese compounds containing pyrazole-based ligands for olefin epoxidation reactions

New robust and effective Mn-pyrazolyl catalysts for olefin epoxidation in [bmim]PF₆ : CH₃CN, with good activity even after several reuses, are described. The cis → trans isomerization in the epoxidation of cis-β-methylstyrene is confirmed through computational calculations.