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.

引用

页码：28 / 34

页数：7

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