A novel chiral oligomeric Salen ligand was synthesized by the reaction of a novel dialdehyde with(1R,2R)-1,2-diaminocyclohexane.From this ligand,the chiral oligomeric Salen-Mn(III) complex was prepared.The new ligand and complex were characterized by FT-IR and UV-Vis spectroscopy.The complex was used as the catalyst for the asymmetric epoxidation of olefins using NaCl and m-CPBA as the oxidants,respectively.In the asymmetric epoxidation of cis-β-methylstyrene,the selectivity and ee for the epoxides reached 98% and 80%,respectively.The catalyst can be reused for three times.