Chiral Mn (III) salen complexes covalently bonded on zirconium oligostyrenylphosphonate-phosphates as catalysts for enantioselective epoxidation of nonfunctionalized alkenes

2009 ◽  
Vol 312 (1-2) ◽  
pp. 40-47 ◽  
Author(s):  
Wenshan Ren ◽  
Xiangkai Fu
Keyword(s):  
Salen Complexes ◽  
Covalently Bonded ◽  
Enantioselective Epoxidation

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.

Reusable chiral macrocyclic Mn(III) salen complexes for enantioselective epoxidation of nonfunctionalized alkenes

2012 ◽  
Vol 286 ◽  
pp. 41-50 ◽  
Author(s):  
Rukhsana I. Kureshy ◽  
Tamal Roy ◽  
Noor-ul H. Khan ◽  
Sayed H.R. Abdi ◽  
Arghya Sadhukhan ◽  
...  
Keyword(s):  
Salen Complexes ◽  
Enantioselective Epoxidation

scholarly journals Chiral MnIII (Salen) Covalently Bonded on Modified ZPS-PVPA and ZPS-IPPA as Efficient Catalysts for Enantioselective Epoxidation of Unfunctionalized Olefins

Polymers ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 108 ◽  
Author(s):  
Xiaochuan Zou ◽  
Cun Wang ◽  
Yue Wang ◽  
Kaiyun Shi ◽  
Zhongming Wang ◽  
...  
Keyword(s):  
Covalently Bonded ◽  
Enantioselective Epoxidation

scholarly journals SINTESIS 7-FORMILINDOL SEBAGAI BAHAN DASAR PEMBENTUK KATALIS EPOKSIDASI BARU (SYNTHESIS OF 7-FORMYLINDOLE AS PRECURSOR OF NEW EPOXIDATION CATALYSTS)

2015 ◽  
Vol 2 (1) ◽  
pp. 78
Author(s):  
H Hayat Sholihin
Keyword(s):  
Target Compound ◽  
New Class ◽  
Salen Complexes ◽  
Key Word ◽  
Salicylaldehyde Derivatives ◽  
Enantioselective Epoxidation ◽  
Target Molecules ◽  
Epoxidation Of Alkenes ◽  
Epoxidation Catalyst ◽  
Initial Target

Manganese (III) salen complexes have been reported as epoxidation catalysts. It is caused a major breakthrough in the enantioselective epoxidation of alkenes into epoxide compounds. This catalyst was synthesized from salicylaldehyde derivatives. Based on the structure, salicylaldehyde is an isosteric nature of 7-folmylindole, consequently opened the door to an array of fascinating and versatile ligand systems, and offer tremendous scope for molecular designe, because of the greatly enhanced capacity for substitution of indoles compared with phenols. Initial target of the project to synthesize of 7-formylindole. There are numerous strategies and methodes to achieve the target molecules. Further study of reaction mechanism of a useful target compound could be explanated and developed as a new class of catalyst. Key word: Epoxidation catalyst, indole, organometal catalyst.

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