A mesoporous silica SBA-15 supported Chiral Salen Co (III) complex as heterogeneous catalysts in asymmetric catalysis

A mesoporous silica SBA-15 supported Chiral Salen Co (III) complex as heterogeneous catalysts in asymmetric catalysis
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Al containing mesoporous SBA-15 was synthesized by two typical method successfully, one is sol-gel method, while the other way is hydro-thermal method.This new homogeneous chiral Co(III) salen complexes were anchored non-covalently on the surfaces of Al-SBA-15 no matter what kind of synthesis method that both gave us a good ruslt. The Bronsted and Lewis acidic sites are attributed to the immobilization of fluorine functionalized chiral salen complexes on the supports. These heterogeneous catalysts could be applied in asymmetric ring opening of terminal epoxides by water and epichlorohydrine (ECH). They showed high enantioselectivity which was up to 99% and good yield in the catalytic synthesis of optically active products.
Table of Contents ABSTRACT i Table of Contents i i List of Figures v List of Schemes viii List of Tables ix 1. Introduction 1 1.1 Background 1 1.2 Basic Definition 2 1.2.1 Introduction to Chirality 2 1.2.2 Enantiomer 5 1.2.3 Importance of Chirality 7 1.2.4 Mesoporous material 9 1.2.5 Heterogeneous Catalyst 11 1.2.6 Hydrolytic kinetic resolution (HKR) 13 1.3Aim of this work 16 2 Experiment 18 2.1 Synthesis of mesoporous Al-SBA-15 support 18 2.1.1 sol-gel synthesis method 18 2.1.2 hydro-thermal synthesis method 20 2.1.3 Comparison of two method 12.2 Chiral (Salen) cobalt complexes immobilized on mesoporous Al-SBA-15 22 2.3 General procedure for the catalytic reaction 25 3. Results and discussion 26 3.1. Characterization of Al- SBA-15 support 26 3.2. Characterization of homogeneous salen complexex 30 3.3. Immobilization of homogeneous salen complexes 36 3.4 Catalytic activity in asymmetric reaction 40 3.5 Recyclability of the heterogeneous catalysts 44 4. Conclusions 47 5. References 48 Acknowledgements 52
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College of Engineering(공과대학) > Chemical Engineering (화학공학) > Theses(화학공학 석박사 학위논문)
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