New immobilized chiral Mn(III) salen complexes on pyridine N-oxide-modified MCM-41 as effective catalysts for epoxidation of nonfunctionalized alkenes

被引：89
|
作者：
Kureshy, RI [1 ]
Ahmad, I [1 ]
Khan, NUH [1 ]
Abdi, SHR [1 ]
Singh, S [1 ]
Pandia, PH [1 ]
Jasra, RV [1 ]
机构：
[1] Cent Salt & Marine Chem Res Inst, Silicates & Catalysis Discipline, Bhavnagar 364002, Gujarat, India
来源：
JOURNAL OF CATALYSIS | 2005年 / 235卷 / 01期
关键词：
enantioselective epoxidation; modified MCM-41; nonfunctionalized alkenes; chiral Mn(III) salen complexes;
D O I：
10.1016/j.jcat.2004.11.002
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We prepared new chiral Mn(III) salen complexes 1'-4' immobilized on pyridine N-oxide-modified MCM-41 through the axial coordination. Epoxidation of styrene and 4-chlorostyrene with the use of these complexes as catalysts in the presence of NaOCl was found to proceed enantioselectively (ee, 62-69%) at 0 degrees C in 8-12 h, which is a significantly higher enantioselectivity than that observed for their homogeneous counterparts (ee, 36-51%). These catalysts were also effective for the relatively bulkier alkenes, such as indene and 2,2-dimethylchromene, and have shown a reactivity (82-98%) and an enantioselectivity (69-92%) similar to those observed for their homogeneous system. The catalysts could be recycled several times without loss of performance. (c) 2004 Published by Elsevier Inc.
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收藏
页码：28 / 34
页数：7
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