Classical and green cyclohexane oxidation catalyzed by manganese porphyrins: Ethanol as solvent and axial ligand

Polyhedron ◽  
2020 ◽  
Vol 187 ◽  
pp. 114627
Author(s):  
Alexandre Moreira Meireles ◽  
Dayse Carvalho da Silva Martins
Keyword(s):  
Axial Ligand ◽  
Cyclohexane Oxidation ◽  
Manganese Porphyrins

Effect of hydrogen bonding on catalytic activity of some manganese porphyrins in epoxidation reactions

2011 ◽  
Vol 15 (03) ◽  
pp. 181-187 ◽  
Author(s):  
Tahereh Alemohammad ◽  
Nasser Safari ◽  
Samira Osati
Keyword(s):  
Hydrogen Bonding ◽  
Catalytic Activity ◽  
Axial Ligand ◽  
Hydroxyl Groups ◽  
Manganese Porphyrins ◽  
Bonding Effect ◽  
Meso Position ◽  
Hydrogen Bonding Effect ◽  
Mn Porphyrins ◽  
Effective Hydrogen

Mn (III)-tetra phenyl porphyrin-acetate (MnTPPOAc) and some kinds of meso-phenyl substituted porphyrins by hydroxyl groups and their Mn (III) complexes were synthesized. These Mn -porphyrins were used as catalyst in the epoxidation of various alkenes with tetra-n-butylammonium hydrogen monopersulfate (n- Bu4NHSO5 ) as oxidant and tetra-n-butylammonium acetate (n- Bu4NOAc ) as the axial ligand. The following order of catalytic activity was observed for cyclooctene: T(2,3-OHP)PMnOAc ≫ T(2,4,6-OHP)PMnOAc ≥ T(4-OHP)PMnOAc ≥ T(2,6-OHP)PMnOAc ≥ TPPMnOAc and T(2,3-OHP)PMnOAc ≫ TPPMnOAc > T(4-OHP)PMnOAc > T(2,4,6-OHP)PMnOAc > T(2,6-OHP)PMnOAc for other alkenes. Different activity and stability of the catalysts were interpreted based on the hydrogen bonding between hydroxyl groups with appropriate orientation on the meso-position of the phenyl groups and axial bases or oxidant. T(2,3-OHP)PMnOAc catalyst has shown optimal condition for effective hydrogen bonding. In the case of other catalysts, electronic and steric factors overcome the hydrogen bonding effect.

An eco-friendly approach to the cyclohexane oxidation catalyzed by manganese porphyrins: Green and solvent-free systems

Polyhedron ◽  
2019 ◽  
Vol 163 ◽  
pp. 144-152 ◽  
Author(s):  
Adriano Silva Guimarães ◽  
Bernardo Schmitberger ◽  
Alexandre Moreira Meireles ◽  
Dayse Carvalho da Silva Martins ◽  
Gilson DeFreitas-Silva
Keyword(s):  
Solvent Free ◽  
Cyclohexane Oxidation ◽  
Manganese Porphyrins

Axial Ligand Effects on the Redox Reactions of Manganese Porphyrins

1999 ◽  
Vol 46 (2) ◽  
pp. 221-227 ◽  
Author(s):  
Chi-Hong Chang ◽  
Shu-Hua Cheng ◽  
Y. Oliver Su
Keyword(s):  
Redox Reactions ◽  
Axial Ligand ◽  
Manganese Porphyrins ◽  
Ligand Effects

Effect of imidazole on biomimetic cyclohexane oxidation by first-, second-, and third-generation manganese porphyrins using PhIO and PhI(OAc)2 as oxidants

2015 ◽  
Vol 491 ◽  
pp. 17-27 ◽  
Author(s):  
Vinicius Santos da Silva ◽  
Alexandre Moreira Meireles ◽  
Dayse Carvalho da Silva Martins ◽  
Júlio Santos Rebouças ◽  
Gilson DeFreitas-Silva ◽  
...  
Keyword(s):  
Cyclohexane Oxidation ◽  
Third Generation ◽  
Manganese Porphyrins

scholarly journals Manganese porphyrins as efficient catalysts in solvent-free cyclohexane oxidation

2020 ◽  
Vol 13 (1) ◽  
pp. 1563-1574 ◽  
Author(s):  
Mariana Goes de Araujo Tôrres ◽  
Vinicius Santos da Silva ◽  
Ynara Marina Idemori ◽  
Gilson DeFreitas-Silva
Keyword(s):  
Solvent Free ◽  
Cyclohexane Oxidation ◽  
Manganese Porphyrins

Selective cyclohexane oxidation catalyzed by manganese porphyrins and co-catalysts

2016 ◽  
Vol 264 ◽  
pp. 185-190 ◽  
Author(s):  
Tao Wang ◽  
Yuanbin She ◽  
Haiyan Fu ◽  
Hui Li
Keyword(s):  
Cyclohexane Oxidation ◽  
Manganese Porphyrins ◽  
Co Catalysts

Magnetic properties of new charge-transfer complexes based on manganese porphyrins

1997 ◽  
Vol 90 (3) ◽  
pp. 407-413
Author(s):  
MARC KELEMEN ◽  
CHRISTOPH WACHTER ◽  
HUBERT WINTER ◽  
ELMAR DORMANN ◽  
RUDOLF GOMPPER ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Charge Transfer ◽  
Charge Transfer Complexes ◽  
Manganese Porphyrins

Development of 96 Multiple Injection-GC-MS Technique and Its Application in Protein Engineering of Natural and Non-Natural Enzymatic Reactions

2019 ◽  
Author(s):  
Anja Knorrscheidt ◽  
Pascal Püllmann ◽  
Eugen Schell ◽  
Dominik Homann ◽  
Erik Freier ◽  
...  
Keyword(s):  
Microtiter Plate ◽  
Axial Ligand ◽  
Cell System ◽  
Enzymatic Reactions ◽  
The Novel ◽  
Internal Standards ◽  
E Coli ◽  
Enzyme Screening ◽  
Plate Analysis ◽  
Microtiter Plate Analysis

Directed evolution requires the screening of enzyme libraries in biological matrices. Available assays are mostly substrate or enzyme specific. Chromatographic techniques like LC and GC overcome this limitation, but require long analysis times. The herein developed multiple injections in a single experimental run (MISER) using GC coupled to MS allows the injection of samples every 33 s resulting in 96-well microtiter plate analysis within 50 min. This technique is implementable in any GC-MS system with autosampling. Since the GC-MS is far less prone to ion suppression than LCMS, no chromatographic separation is required. This allows the utilisation of an internal standards and the detection of main and side-product. To prove the feasibility of the system in enzyme screening, two libraries were assessed: i) YfeX library in an E. coli whole cell system for the carbene-transfer reaction on indole revealing the novel axial ligand tryptophan, ii) a library of 616 chimeras of fungal unspecific peroxygenase (UPO) in S. cerevisiae supernatant for hydroxylation of tetralin resulting in novel constructs. The data quality and representation are automatically assessed by a new R-script.

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