Pulse radiolytic and product analysis studies of the reaction of hydroxyl radicals with cinnamic acid. The relative extent of addition to the ring and side chain

Journal Article · Thu Oct 28 00:00:00 EDT 1982 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100219a033· OSTI ID:6581548

Bobrowski, K; Raghavan, N V

Using pulse radiolysis with optical detection and high-pressure liquid chromatography (HPCL), it has been shown that reaction of OH radicals with cinnamic acid (CA in aqueous solutions leads to addition to both the ring and the olefinic group. The relative extent of the above two pathways was estimated as 3:7, respectively. Benzyl- and hydroxycyclohexadienyl-type radicals were observed with absorption maxima at 320 (310) and 370 (365) nm depending on the pH of the solution. In the pH region 4.9 to 5.7 the absorption at 305 to 315 nm decays during the first 5 ..mu..s after the pulse. The dependence of the rate constants and absorption spectra on pH suggests that this decay is due to an equilibration process between acid-base forms of benzyl-type radicals formed through OH addition to te olefinic group.

• Research Organization: Univ. of Notre Dame, IN
• OSTI ID: 6581548
• Journal Information: J. Phys. Chem.; (United States), Vol. 86:22
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
CINNAMIC ACID
CHEMICAL REACTIONS
RADIOLYSIS
HYDROXYL RADICALS
AQUEOUS SOLUTIONS
ELECTRON BEAMS
EXPERIMENTAL DATA
LIQUID COLUMN CHROMATOGRAPHY
PH VALUE
PULSED IRRADIATION
BEAMS
CARBOXYLIC ACIDS
CHEMICAL RADIATION EFFECTS
CHEMISTRY
CHROMATOGRAPHY
DATA
DECOMPOSITION
DISPERSIONS
INFORMATION
IRRADIATION
LEPTON BEAMS
MIXTURES
MONOCARBOXYLIC ACIDS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PARTICLE BEAMS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
SEPARATION PROCESSES
SOLUTIONS
400600* - Radiation Chemistry