ChemInform Abstract: A Study by ESR Spectroscopy of the Di-tert-butylsilanone Radical Anion

ChemInform ◽  
2010 ◽  
Vol 23 (50) ◽  
pp. no-no
Author(s):  
A. G. DAVIES ◽  
A. G. NEVILLE
Keyword(s):  
Radical Anion ◽  
Esr Spectroscopy

Association of radical anion with alkali cations. IV. ESR study of the 4-nitrobenzophenone radical anion

1980 ◽  
Vol 45 (2) ◽  
pp. 369-375 ◽  
Author(s):  
Stanislav Miertuš ◽  
Ondrej Kyseľ
Keyword(s):  
Hyperfine Splitting ◽  
Radical Anion ◽  
Esr Spectroscopy ◽  
Supporting Electrolyte ◽  
Esr Spectra ◽  
Proton Donor ◽  
Alkali Cations

The 4-nitrobenzophenone radical anion prepared by electrolysis was studied by ESR spectroscopy. On the basis of the interpretation of ESR spectra, the conformation of this system was estimated. The effect of the concentration of supporting electrolyte and of the presence of a proton-donor agent (C2H5OH) was examined. It is assumed that changes in hyperfine splitting constants are caused by association.

Stability of radical anions derived from substituted 5-nitrofurans investigated by ESR spectroscopy

1985 ◽  
Vol 50 (7) ◽  
pp. 1594-1601 ◽  
Author(s):  
Jiří Klíma ◽  
Larisa Baumane ◽  
Janis Stradinš ◽  
Jiří Volke ◽  
Romualds Gavars
Keyword(s):  
Radical Anion ◽  
High Stability ◽  
Esr Spectroscopy ◽  
Reaction Path ◽  
Order Reaction ◽  
Second Order ◽  
Radical Anions ◽  
Second Order Reaction ◽  
Unpaired Electron Density ◽  
The Stability

It has been found that the decay in dimethylformamide and dimethylformamide-water mixtures of radical anions in five of the investigated 5-nitrofurans is governed by a second-order reaction. Only the decay of the radical anion generated from 5-nitro-2-furfural III may be described by an equation including parallel first- and second-order reactions; this behaviour is evidently caused by the relatively high stability of the corresponding dianion, this being an intermediate in the reaction path. The presence of a larger conjugated system in the substituent in position 2 results in a decrease of the unpaired electron density in the nitro group and, consequently, an increase in the stability of the corresponding radical anions.

Structural features of 1,3,5-trifluorobenzene radical anion, as studied by optically detected ESR spectroscopy and quantum chemistry

2013 ◽  
Vol 62 (11) ◽  
pp. 2311-2316 ◽  
Author(s):  
S. V. Blinkova ◽  
M. M. Vyushkova ◽  
L. N. Shchegoleva ◽  
I. V. Beregovaya ◽  
V. A. Bagryansky ◽  
...  
Keyword(s):  
Quantum Chemistry ◽  
Radical Anion ◽  
Esr Spectroscopy ◽  
Structural Features ◽  
Optically Detected

The cis–trans isomerization of the radical anion of biacetyl

1976 ◽  
Vol 54 (23) ◽  
pp. 3637-3640 ◽  
Author(s):  
A. John Elliot ◽  
Jeffrey K. S. Wan
Keyword(s):  
Radical Anion ◽  
Esr Spectroscopy ◽  
Solvent Composition ◽  
Trans Isomers ◽  
Trans Isomerization

The equilibrium between the cis and the trans isomers of the biacetyl radical anion has been studied by esr spectroscopy. The dependence of this equilibrium on the solvent composition and temperature was followed.

Electrochemical investigation of radical-anion reactions of 5-nitro-2-furfuryl derivatives

1984 ◽  
Vol 49 (7) ◽  
pp. 1627-1634
Author(s):  
Jiří Klíma ◽  
Josef Prousek ◽  
Jiří Ludvík ◽  
Jiří Volke
Keyword(s):  
Nucleophilic Substitution ◽  
Radical Anion ◽  
Esr Spectroscopy ◽  
Supporting Electrolyte ◽  
Electrochemical Investigation ◽  
Reduction Step ◽  
Nucleophilic Agent ◽  
Dc Polarography ◽  
Primary Reduction

In the studies on nucleophilic substitution of 5-nitro-2-furfuryl derivatives the function of nucleophilic agent was substituted by electrolysis. The electrochemical reduction of these substances and the follow-up reactions of the intermediates were studied by cyclic voltammetry, dc-polarography and ESR spectroscopy. The primary reduction step is the uptake of a single electron giving rise to the radical anion R-CH2-X- which spontaneously splits off the anion X- and forms the neutral 5-nitro-2-furfuryl radical R-CH2.. This radical may either dimerize to 1,2-bis(5-nitro-2-furyl)ethane or yield 5-nitro-2-methylfuran (VI) through abstraction of hydrogen from the solvent or from the supporting electrolyte or through the uptake of an electron and the following protonation. The mechanism found here confirms the validity of the formerly suggested radical-anion mechanism in the nucleophilic substitution of some 5-nitro-2-furfuryl derivatives.

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