Zeolite effect in the enantioselective transhydrogenation over a Co-salen "ship-in-the-bottle" complex

被引：36

作者：

Kahlen, W ^{[1
]}

Wagner, HH ^{[1
]}

Holderich, WE ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Dept Chem Technol & Heterogeneous Catalysis, D-52074 Aachen, Germany

来源：

CATALYSIS LETTERS | 1998年 / 54卷 / 1-2期

关键词：

Co(II)-salen complexes; ship-in-the-bottle" catalyst; enantioselective transhydrogenation; enantiomeric excess;

D O I：

10.1023/A:1019027921973

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：

Our investigations were focused on the transhydrogenation of carbonyl groups using Co(II)-salen complexes entrapped in zeolites. The Co-salen 1 complex was occluded in the zeolite as a "ship-in-the-bottle" (SIB) catalyst, as could be demonstrated by means of DRIFT-IR spectra, DTG, nitrogen adsorption isothermes and soxhlet extraction. The results of the test reactions show that an immobilization of the Co-salen 1 complex in the zeolite as a "SIB" complex results in an enantiomeric excess as high as in the homogeneous case. The Co-salen 1 USY SIB catalyst shows its best ee-value at higher temperature (25 degrees C) than the homogeneous one (-10 degrees C). The reason could be the steric constraints of the Co-salen complex in the zeolite framework.

引用

页码：85 / 89

页数：5

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