Epoxidation of Unfunctionalized Olefins Catalyzed by Unsymmetric Schiff-base-Mn(Ⅲ) Complexes

Abstract

Abstract: The selective epoxidation of unfunctionalized olefins (styrene, cyclohexene,a-methylstyrene) catalyzed by synthesized unsymmetric Schiff-base-Mn (Ⅲ) complexesMn(CBP-phen-XSal)Cl [X = H, Cl, Br, NO₂, CH₃, OCH₃] and the symmetric analogsMn(CBP-R-CBP)Y[R =CH₂CH₂, CH (CH₃)CH₂, C₆H₄; Y=Cl, OAc] was investigated un-der mild conditions with iodosylbenzene as the terminal oxidant.The results show that theunsymmetric complexes Mn(Ⅲ) (CBP-phen-XSal)Cl is an effective system in catalytically se-lective olefin-epoxidation; the smaller the binding energy of Mn(Ⅲ), the more effective inepoxidation; the highest epoxidation yields of the mentioned three olefins are 73%, 100%and 92% respectively.

Key words: Schiff base, Unsymmetric Schiff-base, Unsymmetric Mn(Ⅲ)-Schiff-base complexes, Epoxidation, Catalytical epoxidation

TrendMD:

DU Xiang-Dong, YU Xian-Da. Epoxidation of Unfunctionalized Olefins Catalyzed by Unsymmetric Schiff-base-Mn(Ⅲ) Complexes[J]. Chem. J. Chinese Universities, 1997, 18(4): 567.

References

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