Effect of support properties on the performance of silica-supported bis(oxazoline)-copper chiral complexes

被引：10

作者：

Fakhfakh, Fatma ^{[1
]}

Baraket, Leila ^{[1
]}

Ghorbel, Abdelhamid ^{[1
]}

Fraile, Jose M. ^{[2
]}

Herrerias, Clara I. ^{[2
]}

Mayoral, Jose A. ^{[2
]}

机构：

[1] Fac Sci Tunis, Dept Chim, Lab Chim Mat & Catalyse, El Manar Tunis 2092, Tunisia

[2] CSIC, Inst Ciencia Mat Aragon, Dept Quim Organ, CSIC, E-50009 Zaragoza, Spain

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2010年 / 329卷 / 1-2期

关键词：

Immobilized catalysts; Enantioselective catalysts; Textural properties; Mesoporous materials; DIELS-ALDER REACTIONS; CYCLOPROPANATION REACTIONS; ENANTIOSELECTIVE CATALYSIS; ELECTROSTATIC INTERACTIONS; HETEROGENEOUS CATALYST; MESOPOROUS SILICA; LIGANDS; FUNCTIONALIZATION; IMMOBILIZATION; BISOXAZOLINES;

D O I：

10.1016/j.molcata.2010.06.012

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：

Mesoporous silica materials with different textural properties have been prepared by sol-gel synthesis under mild acidic conditions, and used as supports for chiral IndaBox ligand. After complexation with copper, these solids are catalysts for cyclopropanation reactions. Enantioselectivities in the range of 52-57% e.e. for cis cyclopropanes and 42-48% e.e. for trans cyclopropanes are obtained without any effect of the textural properties. However, these properties show an important effect on the activity and mainly on the recyclability of the catalyst. In contrast with the expected effect, solids with very large pores but low surface area lead to a significant deactivation upon recovery, whereas solids with highly developed surface area lead to the best overall results. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：21 / 26

页数：6

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