Biomimetic oxidation of cyclic and linear alkanes: high alcohol selectivity promoted by a novel manganese porphyrin catalyst

2017 ◽  
Vol 41 (3) ◽  
pp. 997-1006 ◽  
Author(s):  
Vinicius Santos da Silva ◽  
Warleson Cândido dos Santos Vieira ◽  
Alexandre Moreira Meireles ◽  
Geani Maria Ucoski ◽  
Shirley Nakagaki ◽  
...  
Keyword(s):  
High Alcohol ◽  
Manganese Porphyrin ◽  
Biomimetic Oxidation ◽  
Biomimetic Systems ◽  
Good Catalyst ◽  
Linear Alkanes

A novel β-brominated Mn-porphyrin acts as a good catalyst for alkane (cyclohexane, adamantine and n-hexane) oxidation in biomimetic systems.

Sorption and catalysis by robust microporous metalloporphyrin framework solids

2017 ◽  
Vol 21 (12) ◽  
pp. 857-869
Author(s):  
Dennis W. Smithenry ◽  
Scott R. Wilson ◽  
Shirley Nakagaki ◽  
Kenneth S. Suslick
Keyword(s):  
Metal Complexes ◽  
Free Volume ◽  
Rare Case ◽  
Manganese Porphyrin ◽  
Medium Polarity ◽  
Linear Alkanes

Two isostructural metalloporphyrin framework solids have been synthesized. Both frameworks contains manganese(III) metal complexes of trans-dicarboxylateporphyrins whose peripheralcarboxylates coordinate the edges of tetrahedral Zn4O[Formula: see text] clusters; the two metalloporphyrins explored are Mn(III) and Co(II). The cubic interpenetrated frameworks have 72% free volume and 4 × 7 Å averaged size pores. The evacuated frameworks are robust and retain a structure open to the sorption of substrates with medium polarity. The manganese porphyrin framework catalyzes the hydroxylation of cyclic and linear alkanes with iodosylbenzene as oxidant in a size- and polarity-selective manner. In addition, the catalysis was found to occur within the pores, making this a rare case of porphyrin framework solid with interior catalysis.

Biomimetic systems involving sequential redox reactions in glycolysis – the sulfur effect

2020 ◽  
Vol 56 (85) ◽  
pp. 12917-12920
Author(s):  
Narihito Ogawa ◽  
Sei Furukawa ◽  
Yuya Kosugi ◽  
Takayuki Takazawa ◽  
Nobuhiro Kanomata
Keyword(s):  
Redox Reactions ◽  
Oxidation Reactions ◽  
Biomimetic Oxidation ◽  
Biomimetic Systems ◽  
Sulfur Effect

Magnesium hemithioacetates were used as model cysteine compounds to mimic natural hemithioacetals, and their biomimetic oxidation reactions using a model NAD+ compounds were investigated.

scholarly journals Biomimetic oxidation of carbamazepine with hydrogen peroxide catalyzed by a manganese porphyrin

Química Nova ◽  
2012 ◽  
Vol 35 (7) ◽  
pp. 1477-1481 ◽  
Author(s):  
Cláudia M. B. Neves ◽  
Mário M. Q. Simões ◽  
Fernando M. J. Domingues ◽  
M. Graça P. M. S. Neves ◽  
José A. S. Cavaleiro
Keyword(s):  
Hydrogen Peroxide ◽  
Manganese Porphyrin ◽  
Biomimetic Oxidation

Biomimetic aromatization of Hantzsch 1,4-dihydropyridines with sodium periodate catalyzed by a new polystyrene-bound manganese porphyrin

2006 ◽  
Vol 84 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Majid Moghadam ◽  
Masoud Nasr-Esfahani ◽  
Shahram Tangestaninejad ◽  
Valiollah Mirkhani ◽  
Mohammad Ali Zolfigol
Keyword(s):  
High Activity ◽  
Heterogeneous Catalyst ◽  
Room Temperature ◽  
Sodium Periodate ◽  
Significant Loss ◽  
Manganese Porphyrin ◽  
Biomimetic Oxidation

Efficient oxidation of Hantzsch 1,4-dihydropyridines with sodium periodate catalyzed by a polystyrene-bound manganese(III) porphyrin is reported. This catalyst shows high activity in the oxidation of various 1,4-dihydropyridines at room temperature. This heterogeneous catalyst can be reused five times without significant loss of its activity.Key words: biomimetic oxidation, supported metalloporphyrin, periodate, 1,4-dihydropyridine.

High resolution electron microscopy of lanthanum phosphate crystals

1978 ◽  
Vol 36 (1) ◽  
pp. 274-275
Author(s):  
J. C. Wheatley ◽  
J. M. Cowley
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
High Resolution ◽  
Petroleum Industry ◽  
High Resolution Electron Microscopy ◽  
Lanthanum Phosphate ◽  
Good Catalyst ◽  
Resolution Electron ◽  
Good Catalytic Activity ◽  
Physical And Chemical

Rare-earth phosphates are of particular interest because of their catalytic properties associated with the hydrolysis of many aromatic chlorides in the petroleum industry. Lanthanum phosphates (LaPO4) which have been doped with small amounts of copper have shown increased catalytic activity (1). However the physical and chemical characteristics of the samples leading to good catalytic activity are not known.Many catalysts are amorphous and thus do not easily lend themselves to methods of investigation which would include electron microscopy. However, the LaPO4, crystals are quite suitable samples for high resolution techniques.The samples used were obtained from William L. Kehl of Gulf Research and Development Company. The electron microscopy was carried out on a JEOL JEM-100B which had been modified for high resolution microscopy (2). Standard high resolution techniques were employed. Three different sample types were observed: 669A-1-5-7 (poor catalyst), H-L-2 (good catalyst) and 27-011 (good catalyst).

High Alcohol-Producing Klebsiella Pneumonia is a Bacterial Culprit of Fatty Liver Disease

2019 ◽  
Author(s):  
Jing Yuan ◽  
Xiao Wei ◽  
Xiangna Zhao ◽  
Chen Chen ◽  
Jing Lu ◽  
...  
Keyword(s):  
Liver Disease ◽  
Fatty Liver ◽  
Fatty Liver Disease ◽  
Klebsiella Pneumonia ◽  
High Alcohol

Intermolecular hydrogen transfer in unsaturated hydrocarbons induced by dimeric titanocene

1983 ◽  
Vol 48 (10) ◽  
pp. 2924-2936 ◽  
Author(s):  
Karel Mach ◽  
Lidmila Petrusová ◽  
Helena Antropiusová ◽  
Vladimír Hanuš ◽  
František Tureček ◽  
...  
Keyword(s):  
Hydrogen Transfer ◽  
Titanium Content ◽  
Esr Spectra ◽  
Stable Complex ◽  
Catalytic Complex ◽  
Substitution Reactions ◽  
Unsaturated Hydrocarbons ◽  
Linear Alkanes ◽  
Saturated And Aromatic Hydrocarbons ◽  
Intermolecular Hydrogen Transfer

μ-(η5 : η5-Fulvalene)-di-μ-hydrido-bis(η5-cyclopentadienyltitanium) and μ-(η5 : η5-fulvalene)-μ-chloro-μ-hydrido-bis(cyclopentadienyltitanium) form a thermally stable complex which catalyzes the intermolecular hydrogen transfer in unsaturated hydrocarbons, in addition to isomerizations and cyclizations. Cyclic hydrocarbons disproportionate under catalysis to saturated and aromatic hydrocarbons, while linear olefins yield predominantly linear alkanes and high molecular weight tar. The catalyst enables the hydrocarbon system to approach the thermodynamic equilibrium through a series of substitution reactions between alkyl- and allyltitanocene-like species and olefins and dienes. The catalytic complex was characterized by UV and ESR spectra. About one half of overall titanium content could be converted to mononuclear η3-allyltitanocene-like species, stable up to 400 °C. This exceptional thermal stability is ascribed to a firmly bound allyl containing ligand.

Innate gut microbiota predisposes to high alcohol consumption

2021 ◽  
Author(s):  
Fernando Ezquer ◽  
Maria Elena Quintanilla ◽  
Francisco Moya‐Flores ◽  
Paola Morales ◽  
José Manuel Munita ◽  
...  
Keyword(s):  
Alcohol Consumption ◽  
Gut Microbiota ◽  
High Alcohol ◽  
High Alcohol Consumption
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