Confinement of Fe–Al-PMOF catalytic sites favours the formation of pyrazoline from ethyl diazoacetate with an unusual sharp increase of selectivity upon recycling

2018 ◽  
Vol 54 (73) ◽  
pp. 10308-10311 ◽  
Author(s):  
Brian Abeykoon ◽  
Thomas Devic ◽  
Jean-Marc Grenèche ◽  
Alexandra Fateeva ◽  
Alexander B. Sorokin
Keyword(s):  
Sharp Increase ◽  
Iron Porphyrin ◽  
Ethyl Diazoacetate ◽  
Catalytic Sites

Catalysis inside a porphyrinic MOF resulted in the formation of pyrazoline from ethyl diazoacetate which was not observed in the presence of a homogeneous iron porphyrin.

Iron Porphyrin Catalyzed N—H Insertion Reaction with Ethyl Diazoacetate.

ChemInform ◽  
2007 ◽  
Vol 38 (47) ◽  
Author(s):  
Lynnette K. Baumann ◽  
Harun M. Mbuvi ◽  
Guodong Du ◽  
L. Keith Woo
Keyword(s):  
Insertion Reaction ◽  
Iron Porphyrin ◽  
Ethyl Diazoacetate

Iron Porphyrin-Catalyzed Olefination of Carbonyl Compounds with Ethyl Diazoacetate

2003 ◽  
Vol 22 (7) ◽  
pp. 1468-1474 ◽  
Author(s):  
Guilong Cheng ◽  
Gholam A. Mirafzal ◽  
L. Keith Woo
Keyword(s):  
Carbonyl Compounds ◽  
Iron Porphyrin ◽  
Ethyl Diazoacetate

Iron Porphyrin Catalyzed N−H Insertion Reactions with Ethyl Diazoacetate

2007 ◽  
Vol 26 (16) ◽  
pp. 3995-4002 ◽  
Author(s):  
Lynnette K. Baumann ◽  
Harun M. Mbuvi ◽  
Guodong Du ◽  
L. Keith Woo
Keyword(s):  
Iron Porphyrin ◽  
Insertion Reactions ◽  
Ethyl Diazoacetate

ChemInform Abstract: Iron Porphyrin-Catalyzed Three-Component Reaction of Ethyl Diazoacetate with Aliphatic Amines and β,γ-Unsaturated α-Keto Esters.

ChemInform ◽  
2014 ◽  
Vol 45 (21) ◽  
pp. no-no
Author(s):  
Chaoqun Ma ◽  
Dong Xing ◽  
Changwei Zhai ◽  
Jiuwei Che ◽  
Shunying Liu ◽  
...  
Keyword(s):  
Aliphatic Amines ◽  
Iron Porphyrin ◽  
Ethyl Diazoacetate ◽  
Keto Esters ◽  
Three Component Reaction

Iron Porphyrin-Catalyzed Three-Component Reaction of Ethyl Diazoacetate with Aliphatic Amines and β,γ-Unsaturated α-Keto Esters

2013 ◽  
Vol 15 (24) ◽  
pp. 6140-6143 ◽  
Author(s):  
Chaoqun Ma ◽  
Dong Xing ◽  
Changwei Zhai ◽  
Jiuwei Che ◽  
Shunying Liu ◽  
...  
Keyword(s):  
Aliphatic Amines ◽  
Iron Porphyrin ◽  
Ethyl Diazoacetate ◽  
Keto Esters ◽  
Three Component Reaction

World Economic Crisis as a Process of Substitution of Technological Modes

2009 ◽  
pp. 26-38 ◽  
Author(s):  
S. Glaziev
Keyword(s):  
Economic Crisis ◽  
Economic Activity ◽  
Sharp Increase ◽  
Energy Resources ◽  
Long Wave ◽  
The World ◽  
World Economic ◽  
Technological Mode ◽  
World Economic Crisis

The article analyzes fundamental reasons for the world economic crisis in the light of global technological shifts. It proves that it is caused by the substitution of technological modes. It is shown that sharp increase and slump in stock indices and prices for energy resources are typical of the process of technological substitution which occurs regularly according to the rhythm of long-wave fluctuations of the world economic activity. The article rationalizes a package of anti-crisis measures aimed at stimulating the new technological mode. Its structure and role of the locomotive factor of the new long wave of economic growth are revealed.

Synthesis of HTCMgFe for the degradation of indigo carmine through heterogeneous photo-Fenton treatment

MRS Advances ◽  
2020 ◽  
Vol 5 (62) ◽  
pp. 3273-3282
Author(s):  
I. Cosme-Torres ◽  
M.G. Macedo-Miranda ◽  
S.M. Martinez-Gallegos ◽  
J.C. González-Juárez ◽  
G. Roa-Morales ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Treatment Time ◽  
Uv Light ◽  
Indigo Carmine ◽  
Oh Radicals ◽  
Absorption Bands ◽  
Chromophore Group ◽  
X Ray ◽  
Catalytic Sites ◽  
Scanning Electron

AbstractThe heterogeneous catalyst HTCMgFe was used in the degradation of the IC, through the heterogeneous photo-fenton treatment, this material in combination with H2O2 and UV light degraded the dye in 30 min at pH 3. As the amount of HTCMgFe increases the degradation it was accelerated because there are more active catalytic sites of Fe2+ on the surface of the material, which generates a greater amount of •OH radicals. The HTCMgFe was characterized by infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray energy dispersive elemental analysis (EDS). The UV-vis spectrum shows that the absorption bands belonging to the chromophore group of the IC disappear as the treatment time passes, indicating the degradation of the dye.

An NADH-Inspired Redox Mediator Strategy to Promote Second-Sphere Electron and Proton Transfer for Cooperative Electrochemical CO2 Reduction Catalyzed by Iron Porphyrin

2020 ◽  
Author(s):  
Peter T. Smith ◽  
Sophia Weng ◽  
Christopher Chang
Keyword(s):  
Proton Transfer ◽  
Co2 Reduction ◽  
Iron Porphyrin ◽  
Redox Mediators ◽  
Reservoir Properties ◽  
Proton Reduction ◽  
Electrochemical Co2 Reduction ◽  
Starting Point ◽  
Rate Improvement ◽  
Molecular Catalysts

We present a bioinspired strategy for enhancing electrochemical carbon dioxide reduction catalysis by cooperative use of base-metal molecular catalysts with intermolecular second-sphere redox mediators that facilitate both electron and proton transfer. Functional synthetic mimics of the biological redox cofactor NADH, which are electrochemically stable and are capable of mediating both electron and proton transfer, can enhance the activity of an iron porphyrin catalyst for electrochemical reduction of CO<sub>2</sub> to CO, achieving a 13-fold rate improvement without altering the intrinsic high selectivity of this catalyst platform for CO<sub>2</sub> versus proton reduction. Evaluation of a systematic series of NADH analogs and redox-inactive control additives with varying proton and electron reservoir properties reveals that both electron and proton transfer contribute to the observed catalytic enhancements. This work establishes that second-sphere dual control of electron and proton inventories is a viable design strategy for developing more effective electrocatalysts for CO<sub>2</sub> reduction, providing a starting point for broader applications of this approach to other multi-electron, multi-proton transformations.

Nanometer Scale Spectroscopic Visualization of Catalytic Sites During a Hydrogenation Reaction on a Pd/Au Bimetallic Catalyst

2020 ◽  
Author(s):  
hao yin ◽  
Liqing Zheng ◽  
Wei Fang ◽  
Yin-Hung Lai ◽  
Nikolaus Porenta ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Density Functional ◽  
Hydrogen Transfer ◽  
Bimetallic Catalyst ◽  
Local Environment ◽  
Hydrogenation Reaction ◽  
Boundary Density ◽  
Catalytic Sites ◽  
Powerful Analytical Tool ◽  
Tip Enhanced Raman Spectroscopy

<p>Understanding the mechanism of catalytic hydrogenation at the local environment requires chemical and topographic information involving catalytic sites, active hydrogen species and their spatial distribution. Here, tip-enhanced Raman spectroscopy (TERS) was employed to study the catalytic hydrogenation of chloro-nitrobenzenethiol on a well-defined Pd(sub-monolayer)/Au(111) bimetallic catalyst (<i>p</i><sub>H2</sub>=1.5 bar, 298 K), where the surface topography and chemical fingerprint information were simultaneously mapped with nanoscale resolution (≈10 nm). TERS imaging of the surface after catalytic hydrogenation confirms that the reaction occurs beyond the location of Pd sites. The results demonstrate that hydrogen spillover accelerates hydrogenation at the Au sites within 20 nm from the bimetallic Pd/Au boundary. Density functional theory was used to elucidate the thermodynamics of interfacial hydrogen transfer. We demonstrate that TERS as a powerful analytical tool provides a unique approach to spatially investigate the local structure-reactivity relationship in catalysis.</p>

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