期刊
POLYMERS
卷 9, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/polym9030108
关键词
Chiral Mn-III (salen) complex; hybrid zirconium phosphonate; covalent attachment; heterogeneous catalyst; asymmetric epoxidation
资金
- Basic and Frontier Research Project of Chongqing [cstc2015jcyjA0317, cstc2013jcyjA50033]
- Scientific and Technological Research Program of Chongqing Municipal Education Commission [KJ1501411, KJ131513, KJ131512, KJ1601403, KJ1601412]
- Innovation Team Building at Institutions of Higher Education in Chongqing [KJTD201325]
- Key Laboratory of green synthesis and analysis of Chongqing University of Education [16xjpt08]
- Innovative Research Team in Chongqing University of Education [KYC-cxtd03-20141002]
Chiral MnIII (salen) complex supported on modified ZPS-PVPA (zirconium poly(styrene-phenylvinylphosphonate)) and ZPS-IPPA (zirconium poly(styrene-isopropenyl phosphonate)) were prepared using -CH2Cl as a reactive surface modifier by a covalent grafting method. The supported catalysts showed higher chiral induction (ee: 72%-83%) compared with the corresponding homogeneous catalyst (ee: 54%) for asymmetric epoxidation of alpha-methylstrene in the presence of 4-phenylpyridine N-oxide (PPNO) as axial base using NaClO as an oxidant. ZPS-PVPA-based catalyst 1, with a larger pore diameter and surface area, was found to be more active than ZPS-IPPA-based catalyst 2. In addition, bulkier alkene-like indene, was efficiently epoxidized with these supported catalysts (ee: 96%-99%), the results weremuch higher than those for the homogeneous system(ee: 65%). Moreover, the prepared catalysts were relatively stable and can be recycled at least eight times without significant loss of activity and enantioselectivity.
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