Formation of radical zwitterions from methoxylated benzoic acids. 2. OH adducts as precursors
Using spectrophotometric and conductometric pulse radiolysis and in situ electron spin resonance techniques it was found that OH adducts, formed from mono-, di-, and trimethoxylated benzoic acids by attachment of OH to nonsubstituted ring positions, react with H/sup +/ (k = 10/sup 8/ - 10/sup 9/ M/sup -1/ s/sup -1/) to yield radical zwitterions via elimination of H/sub 2/O from the protonated OH adduct. With OH adducts from 2,4- and 2,6-dimethoxybenzoic acid and 2,4,5- and 2,4,6-trimethoxybenzoic acid radical zwitterions are additionally produced by a pH independent process involving elimination of OH/sup -/ (k approximately equal to 4 x 10/sup 4/ s/sup -1/). The radical zwitterions react with H adducts with rate constants of (8 to 40) x 10/sup 8/ M/sup -1/ s/sup -1/.
- Research Organization:
- Institut fuer Strahlenchemie, Muelheim/Ruhr, Ger.
- OSTI ID:
- 7315006
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 81:1; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
400600* -- Radiation Chemistry
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
HYDROXYL RADICALS
INTERMEDIATE STRUCTURE
IONS
IRRADIATION
KINETICS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PH VALUE
PULSED IRRADIATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION KINETICS