Rate coefficients of the initial steps of radiation induced oligomerization of acrylates in dilute aqueous solution

1999 ◽  
Vol 55 (5-6) ◽  
pp. 639-644 ◽  
Author(s):  
László Wojnárovits ◽  
Erzsébet Takács
Keyword(s):  
Aqueous Solution ◽  
Rate Coefficients ◽  
Dilute Aqueous Solution ◽  
Radiation Induced

Kinetics, stoicheiometry, and mechanism in the bromination of aromatic heterocycles. I. Aqueous bromination of pyrazole, 1-methylpyrazole, and 3,5-dimethylpyrazole

1971 ◽  
Vol 24 (7) ◽  
pp. 1413 ◽  
Author(s):  
BE Boulton ◽  
BAW Coller
Keyword(s):  
Aqueous Solution ◽  
Potentiometric Titration ◽  
Electrode Potential ◽  
Rate Coefficients ◽  
Molecular Bromine ◽  
Aromatic Heterocycles ◽  
Dilute Aqueous Solution ◽  
Direct Attack ◽  
Rate Behaviour ◽  
Bromide Solutions

A procedure is described for monitoring the reactivity of a substrate towards bromine in aqueous bromide solutions, as a function of extent of reaction, by following the changes of electrode potential with time in the intervals between successive periods of electrolysis. ��� The title compounds show 1 : 1 stoicheiometry with substitution in the 4-position. The observed rate behaviour may be understood in terms of direct attack by molecular bromine on the neutral substrate molecules, rate coefficients for dilute aqueous solution at 25�C being: ����� k20(Br2+pyrazole) = 3.8x105 dm3 mol-1 s-1, kH/kD = 1.39;����� k20(Br2+1.methylpyrazole) = 8.0x105 dm3 mol-1 s-1;����� k20(Br2+3,5-dimethylpyrazole) = 1.4x109 dm3 mol-1 s-1, kH/kD = 1.08 Values of pKa(pyrazole-H+) = 2.58 and pKa(3,5-dimethylpyrazole-H+) = 4.11 were determined by potentiometric titration methods.

scholarly journals High-energy ionizing radiation-induced degradation of amodiaquine in dilute aqueous solution: radical reactions and kinetics

2020 ◽  
Vol 54 (2-3) ◽  
pp. 185-194
Author(s):  
Krisztina Kovács ◽  
Ádám Simon ◽  
György Tibor Balogh ◽  
Tünde Tóth ◽  
László Wojnárovits
Keyword(s):  
Aqueous Solution ◽  
Ionizing Radiation ◽  
High Energy ◽  
Radical Reactions ◽  
Dilute Aqueous Solution ◽  
Radiation Induced

Radiation induced degradation of ketoprofen in dilute aqueous solution

2012 ◽  
Vol 81 (9) ◽  
pp. 1479-1483 ◽  
Author(s):  
Erzsébet Illés ◽  
Erzsébet Takács ◽  
András Dombi ◽  
Krisztina Gajda-Schrantz ◽  
Katalin Gonter ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Dilute Aqueous Solution ◽  
Radiation Induced
Sign in / Sign up

Export Citation Format

Share Document