Oxidation of Hydroxymalonic Acid by OH Radicals in the Presence and in the Absence of Molecular Oxygen. A Pulse-Radiolysis and Product Study

1995 ◽  
Vol 99 (22) ◽  
pp. 9122-9129 ◽  
Author(s):  
Man Nien Schuchmann ◽  
Heinz-Peter Schuchmann ◽  
Clemens von Sonntag
Keyword(s):  
Molecular Oxygen ◽  
Pulse Radiolysis ◽  
Oh Radicals ◽  
Product Study

Product Study of the Reaction of CH3with OH Radicals at Low Pressures and Temperatures of 300 and 612 K†

2005 ◽  
Vol 109 (17) ◽  
pp. 8415-8427 ◽  
Author(s):  
Christopher Fockenberg ◽  
Ralph E. Weston, ◽  
James T. Muckerman
Keyword(s):  
Oh Radicals ◽  
Low Pressures ◽  
Product Study

Reactions of OH Radicals with Acetylacetone in Aqueous Solution. A Pulse Radiolysis and Electron Spin Resonance Study

1982 ◽  
Vol 37 (3) ◽  
pp. 368-375 ◽  
Author(s):  
R. K. Broszkiewicz ◽  
T. Söylemez ◽  
D. Schulte-Frohlinde
Keyword(s):  
Double Bond ◽  
Pulse Radiolysis ◽  
Visible Region ◽  
Alkaline Condition ◽  
Main Reaction ◽  
Electron Spin Resonance Study ◽  
Oh Radicals ◽  
Oh Radical ◽  
Keto Form ◽  
Optical Absorbance

Abstract Pulse radiolysis experiments monitoring optical absorbance as well as conductivity and in-situ ESR radiolysis studies show that the OH radical reacts with the enol (k=8.6 x 109 M-1 s-1) and the enolate (k = 7.4 X 109 M-1 s-1) forms of acetylacetone by addition to the C = C double bond in aqueous N2O saturated solution. The OH reaction with enol leads to equal amounts of two radicals, CH3COCHOHCOHCH3 (2) and CH3COCHC(OH)2CH3 (4), as determined by scavenger reactions. At pH less than 1 the radical CH3COCHCOCH3 (1) is observed by ESR spectroscopy showing that radical 2 and/or 4 eliminate water by proton catalyzed reactions. Under alkaline condition the OH adducts to the enolate eliminate OH -with rate constants larger than 105 s-1 leading to radical 1. G(OH-) is determined to be 5.6 showing that addition is the main reaction of OH with enolate. To a much smaller degree the OH radical is proposed to abstract an H atom from that CH3 group which is attached to the C -C double bond in enol and enolate, producing substituted allyl radicals which absorb in the visible region. The reaction of OH with the keto form has not been observed indicating that the rate constant of this reaction is significantly smaller than those with enol and enolate.

Product study of the reaction of OH radicals with isoprene in the atmosphere simulation chamber SAPHIR

2006 ◽  
Vol 55 (2) ◽  
pp. 167-187 ◽  
Author(s):  
M. Karl ◽  
H.-P. Dorn ◽  
F. Holland ◽  
R. Koppmann ◽  
D. Poppe ◽  
...  
Keyword(s):  
Oh Radicals ◽  
Atmosphere Simulation Chamber ◽  
Product Study ◽  
Simulation Chamber

Pulse Radiolysis of Cycloserine in Aqueous Solutions. One-Electron Oxidation by OH Radicals

1984 ◽  
Vol 57 (12) ◽  
pp. 3403-3407 ◽  
Author(s):  
Masako Tanaka ◽  
Hiroshi Sakuma ◽  
Osamu Kohanawa ◽  
Seijun Fukaya ◽  
Meiseki Katayama
Keyword(s):  
Aqueous Solutions ◽  
Pulse Radiolysis ◽  
Oh Radicals

scholarly journals Pulse Radiolysis Study of Reaction of OH Radicals with Triose Reductone

1986 ◽  
Vol 59 (3) ◽  
pp. 721-724 ◽  
Author(s):  
Hideo Horii ◽  
Yasuo Abe ◽  
Setsuo Taniguchi
Keyword(s):  
Pulse Radiolysis ◽  
Oh Radicals

A pulse radiolysis study of solvated electrons in tert-butanol/water solutions

1986 ◽  
Vol 64 (8) ◽  
pp. 1548-1552
Author(s):  
Joanna Cygler ◽  
Norman V. Klassen ◽  
Carl K. Ross
Keyword(s):  
Experimental Data ◽  
Pulse Radiolysis ◽  
Oh Radicals ◽  
Solvated Electrons ◽  
Secondary Electrons ◽  
Water Solutions ◽  
Tert Butanol

Many solutes, added to water in amounts of a few mol%, cause an increase in the yield of solvated electrons (es−) measured by pulse radiolysis. A pulse radiolysis study of tert-butanol (tBuOH) in D2O has been carried out to investigate this phenomenon. Detailed measurements of the yield, measured as Gεmax(es−), and the deeay of solvated electrons were made at 6, 25, and 46 °C over the range 0–5mol% tBuOH. The maximum Gεmax(es−) occurs at about 1 mol% tBuOH, but the exact concentration depends on the temperature of the sample and the time after the pulse at which the measurement is made. Three factors are examined as contributing to the increased Gεmax(es−) in the presence of tBuOH and certain other solutes. They are (i) the change in viscosity produced by the added solute, (ii) the scavenging of OH radicals by the solute, thereby reducing the reaction of OH with es− and (iii) the possibility that the addition of the solute leads to an increase in the thermalization distance of the secondary electrons. It is concluded that effects (i) and (ii) are sufficient to explain the existing experimental data.

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