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.

The Formation and Reactions of Disulfide Radical Anions in Aqueous Solution

1975 ◽  
Vol 53 (21) ◽  
pp. 3153-3157 ◽  
Author(s):  
Tzu-Lin Tung ◽  
John A. Stone
Keyword(s):  
Aqueous Solution ◽  
Radical Anion ◽  
Flash Photolysis ◽  
Ph Dependence ◽  
Order Reaction ◽  
Radical Anions ◽  
Second Order Reaction ◽  
Low Concentration ◽  
First Order ◽  
Rate Of Decay

Transient disulfide radical anions have been produced by flash photolysis. Cyclic anions decay only by second order reaction as opposed to the first order decay found for linear ones at low concentration. Linear disulfides, except oxidized penicillamine, increase the rate of decay of the cystine radical anion. The pH dependence of the reaction with cystine suggests that the disulfide radical anion is an electrophile.

Kinetics of the reaction between hexamethylenediisocyanate and 1-pentanol

1983 ◽  
Vol 48 (11) ◽  
pp. 3279-3286
Author(s):  
Slavko Hudeček ◽  
Miloslav Bohdanecký ◽  
Ivana Hudečková ◽  
Pavel Špaček ◽  
Pavel Čefelín
Keyword(s):  
Liquid Chromatography ◽  
Rate Constants ◽  
Reversed Phase ◽  
Order Reaction ◽  
Second Order ◽  
Second Order Reaction ◽  
Reversed Phase Liquid Chromatography ◽  
Consecutive Reactions ◽  
Phase Liquid ◽  
Kinetics Of

The reaction between hexamethylenediisocyanate and 1-pentanol in toluene was studied by means of reversed-phase liquid chromatography. By employing this method, it was possible to determine all components of the reaction mixture including both products, i.e. N-(6-isocyanate hexyl)pentylcarbamate and N,N'-bis(pentyloxycarbonyl)hexamethylenediamine. Relations for the calculation of kinetic constants were derived assuming a competitive consecutive second-order reaction. It was demonstrated that the reaction involved in this case is indeed a second-order reaction, and the rate constants of the first and second consecutive reactions were determined.

Analytical resolution of a parallel second-order reaction mechanism

2003 ◽  
Vol 35 (6) ◽  
pp. 246-251
Author(s):  
A. E. Croce ◽  
L. V. Mogni ◽  
C. Vicente Irrazábal
Keyword(s):  
Reaction Mechanism ◽  
Order Reaction ◽  
Second Order ◽  
Second Order Reaction ◽  
Analytical Resolution

scholarly journals Ribonucleic acid–deoxyribonucleic acid hybridization as a second-order reaction

1973 ◽  
Vol 135 (3) ◽  
pp. 573-576 ◽  
Author(s):  
Bryan D. Young ◽  
John Paul
Keyword(s):  
Dna Hybridization ◽  
Ribonucleic Acid ◽  
Deoxyribonucleic Acid ◽  
Order Reaction ◽  
Second Order ◽  
Second Order Reaction ◽  
Reaction Theory

Certain features of RNA–DNA hybridization can be accounted for in terms of second-order-reaction theory. These include the use of annealing kinetics to estimate RNA complexity and the occurrence of approximately linear double-reciprocal plots.

Theory of Ostwald ripening due to a second-order reaction

1995 ◽  
Vol 33 (3) ◽  
pp. 363-367 ◽  
Author(s):  
L. Ratke ◽  
D. Uffelmann ◽  
W. Bender ◽  
P.W. Voorhees
Keyword(s):  
Ostwald Ripening ◽  
Order Reaction ◽  
Second Order ◽  
Second Order Reaction
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