Réduction électrochimique de cétones aromatiques encombrées en milieu aprotique et en présence de chlorure de manganèse

1983 ◽  
Vol 61 (9) ◽  
pp. 2121-2125 ◽  
Author(s):  
Françoise Fournier ◽  
Jacques Berthelot ◽  
Yves-Louis Pascal
Keyword(s):  
Electrochemical Reduction ◽  
Electrode Surface ◽  
Reduction Potential ◽  
Aromatic Ketones ◽  
Aprotic Medium ◽  
Total Lack

The electrochemical reduction of hindered aromatic ketones which are difficult to reduce can be achieved in an aprotic medium (DMF) on a mercury pool cathode, in presence of Mn(II) chloride, at the reduction potential of the Mn(II)/Mn(0) system, but less negative than that of the ketone itself. There is selective hydrodimerization into an α-glycol, with total lack of polymerization. With dissymmetric ketones, the dl diastereoisomers of the diols are produced preferentially. The effect of manganese is due either to the reduction of a Mn(I) or Mn(0) – ketone complex or to the reduction of the ketone by a film of colloidal manganese on the electrode surface.

Features of electrochemical reduction of silk fibroin in the presence of phosphate tricalcium in the form of nanocating

2021 ◽  
pp. 2150476
Author(s):  
Khakkulov Jakhongir Mardonovich ◽  
Kholmuminov Abdufatto Akhatovich ◽  
Temirov Zokir Shukurulloevich
Keyword(s):  
Shear Flow ◽  
Electrochemical Reduction ◽  
Silk Fibroin ◽  
Tricalcium Phosphate ◽  
Electrode Surface ◽  
Newtonian Flow ◽  
Phosphate Ions

The possibilities of movement and electrochemical reduction of fibroin macroions in the presence of tricalcium phosphate ions in the form of a nanocoating during electrolysis have been studied. The manifestation of a non-Newtonian flow of a mixture of macroions and ions in a shear flow, the conditions for their electrochemical reduction in the form of a nanocoating with uniform morphology, and thickness on the electrode surface are revealed. It was found that the excess ions in the mixture and the uneven relief of the electrode surface contribute to the formation of a nanocoating with an inhomogeneous and uneven thickness.

Electrochemical reduction of some compounds of two-coordinate phosphorus and arsenic in an aprotic medium

1992 ◽  
Vol 41 (8) ◽  
pp. 1358-1362
Author(s):  
T. V. Troepol'skaya ◽  
G. A. Vagina ◽  
�. I. Yakusheva ◽  
A. S. Ionkin ◽  
N. V. Nikolaeva ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Aprotic Medium

scholarly journals Surface Electrochemistry of Uranium Dioxide in Acidic Hydrogen Peroxide Solutions

2012 ◽  
Vol 1475 ◽  
Author(s):  
Mayuri Razdan ◽  
David Hall ◽  
David W. Shoesmith
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Layer ◽  
Electrochemical Reduction ◽  
Surface Diffusion ◽  
Uranium Dioxide ◽  
Electrode Surface ◽  
Surface Electrochemistry ◽  
Ph Range ◽  
Acidic Hydrogen

ABSTRACTThe electrochemical reduction of H2O2 on SIMFUEL was investigated over the pH range 1 to 4. The mechanism at pH 4 is known to occur on UV species incorporated into a surface layer of UIV1-2xUV2xO2+x. However, below pH 3, reduction occurs on an adsorbed UVO2(OH) state which is unstable and oxidizes to insulating UVI before dissolving as UO22+. Both schemes are observed at intermediate pH’s. The presence of both low and high acidic regions at the electrode surface is determined by the combination of peroxide concentration, bulk pH and the surface diffusion conditions.

Réduction catalytique de cétones α,β-éthyléniques à température modérée par

1979 ◽  
Vol 57 (2) ◽  
pp. 218-221 ◽  
Author(s):  
D. Beaupere ◽  
P. Bauer ◽  
R. Uzan
Keyword(s):  
Electrochemical Reduction ◽  
Reduction Potential ◽  
Initial Rate ◽  
Substituent Effects ◽  
Hydrogenation Reaction ◽  
Unsaturated Ketones ◽  
Hydride Ion ◽  
Inverse Effect ◽  
Electron Donating Groups

The use of the catalyst [Formula: see text] in the reduction of the ethylenic system of styryl ketones by 1-phenylethanol permits the hydrogenation reaction to proceed at 50 °C. Some substituent effects in the α,β-unsaturated ketones were demonstrated at this temperature. These showed an increase in the initial rate of reduction for electron-attracting groups and the inverse effect for electron-donating groups. The observation of a relation between the electrochemical reduction potential of these ketones and their rate of hydrogenation suggests a transfer of hydrogen to the ketone by a hydride ion intermediate. [Journal translation]

Réduction électrochimique de dérivés carbonylés en milieu non aqueux en présence de EuCl3•6H2O

1987 ◽  
Vol 65 (3) ◽  
pp. 549-556 ◽  
Author(s):  
Jamaâ Douch ◽  
Guy Mousset
Keyword(s):  
Electrochemical Reduction ◽  
Ligand Exchange ◽  
Water Molecules ◽  
Nonaqueous Solvent ◽  
Aromatic Ketones ◽  
Voltammetric Study ◽  
Electrode Interface

The electrochemical reduction of aromatic or α,β ethylenic aromatic ketones in nonaqueous solvent (DMF) has been performed in the presence of EuCl3•6H2O. Ligand exchange between DMF and water molecules of the europium salt was first studied. A voltammetric study shows that complexation involving electrogenerated Eu(II) and ketone may occur at the electrode interface or in solution, leading respectively to [Formula: see text] and [Formula: see text] stoichiometries. The stereochemistry of hydrodimerization products is studied.

Electrochemical reduction of triphenyltin chloride in aprotic medium

1976 ◽  
Vol 121 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Gian-Antonio Mazzocchin ◽  
Renato Seeber ◽  
Gino Bontempelli
Keyword(s):  
Electrochemical Reduction ◽  
Aprotic Medium ◽  
Triphenyltin Chloride
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