Chiral Mn(III) salen complexes covalently bonded on modified MCM-41 and SBA-15 as efficient catalysts for enantioselective epoxidation of nonfunctionalized alkenes

2006 ◽  
Vol 238 (1) ◽  
pp. 134-141 ◽  
Author(s):  
R KURESHY ◽  
I AHMAD ◽  
N KHAN ◽  
S ABDI ◽  
K PATHAK ◽  
...  
Keyword(s):  
Salen Complexes ◽  
Covalently Bonded ◽  
Enantioselective Epoxidation ◽  
Mcm 41

scholarly journals Chiral MnIII (Salen) Immobilized on Organic Polymer/Inorganic Zirconium Hydrogen Phosphate Functionalized with 3-Aminopropyltrimethoxysilane as an Efficient and Recyclable Catalyst for Enantioselective Epoxidation of Styrene

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 212 ◽  
Author(s):  
Xiaochuan Zou ◽  
Yue Wang ◽  
Cun Wang ◽  
Kaiyun Shi ◽  
Yanrong Ren ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Supported Catalysts ◽  
Organic Polymer ◽  
Solid Catalyst ◽  
Homogeneous Catalyst ◽  
Hydrogen Phosphate ◽  
Characterization Methods ◽  
Salen Complexes ◽  
Enantioselective Epoxidation ◽  
Better Than

Organic polymers/inorganic zirconium hydrogen phosphate (ZSPP, ZPS-IPPA, and ZPS-PVPA) functionalized with 3-aminopropyltrimethoxysilane were prepared and used to support chiral MnIII (salen) complexes (Jacobsen’s catalyst). Different characterization methods demonstrated that the chiral MnIII (salen) complexes was successfully supported on the surface of the carrier (ZSPP, ZPS-IPPA, or ZPS-PVPA) through a 3-aminopropyltrimethoxysilane group spacer. The supported catalysts effectively catalyzed epoxidation of styrene with m-chloroperbenzoic acid (m-CPBA) as an oxidant in the presence of N-methylmorpholine N-oxide (NMO) as an axial base. These results (ee%, 53.3–63.9) were significantly better than those achieved under a homogeneous counterpart (ee%, 46.2). Moreover, it is obvious that there was no significant decrease in catalytic activity after the catalyst 3 was recycled four times (cons%: from 95.0 to 92.6; ee%: from 64.7 to 60.1). Further recycles of catalyst 3 resulted in poor conversions, although the enantioselectivity obtained was still higher than that of corresponding homogeneous catalyst even after eight times. After the end of the eighth reaction, the solid catalyst was allowed to stand in 2 mol/L of dilute hydrochloric acid overnight, prompting an unexpected discovery that the catalytic activity of the catalyst was recovered again at the 9th and 10th cycles of the catalyst.

Fast to Ultrafast Dynamics of Palladium Phthalocyanine Covalently Bonded to MCM-41 Mesoporous Material

2009 ◽  
Vol 113 (44) ◽  
pp. 19199-19207 ◽  
Author(s):  
Anna Synak ◽  
Michał Gil ◽  
Juan Angel Organero ◽  
Félix Sánchez ◽  
Marta Iglesias ◽  
...  
Keyword(s):  
Mesoporous Material ◽  
Ultrafast Dynamics ◽  
Covalently Bonded ◽  
Mcm 41

MCM-41 anchored manganese salen complexes as catalysts for limonene oxidation

2009 ◽  
Vol 120 (3) ◽  
pp. 432-440 ◽  
Author(s):  
P. Oliveira ◽  
A. Machado ◽  
A.M. Ramos ◽  
I. Fonseca ◽  
F.M. Braz Fernandes ◽  
...  
Keyword(s):  
Salen Complexes ◽  
Mcm 41 ◽  
Limonene Oxidation
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