Electron spin resonance studies. Part 71. Side-chain oxidation pathways in the reactions of ˙OH and SO4–˙ with some phenyl-substituted carboxylic acids, their anions, and some related compounds

1987 ◽  
pp. 371-380 ◽  
Author(s):  
Bruce C. Gilbert ◽  
Cathryn J. Scarratt ◽  
C. Barry Thomas ◽  
John Young
Keyword(s):  
Electron Spin Resonance ◽  
Carboxylic Acids ◽  
Electron Spin ◽  
Side Chain ◽  
Chain Oxidation ◽  
Spin Resonance ◽  
Related Compounds

1H-NMR - und ESR -Messungen zur Struktur der Dehydroascorbinsäure und des Semidehydroascorbatradikals / 1H-NMR- and ESR-Investigations on the Structures of Dehydroascorbic Acid and the Semidehydroascorbate Radical

1982 ◽  
Vol 37 (1-2) ◽  
pp. 129-131 ◽  
Author(s):  
Helmut Sapper ◽  
Anita Pleyer-Weber ◽  
Wolfgang Lohmann
Keyword(s):  
Electron Spin Resonance ◽  
1H Nmr ◽  
Electron Spin ◽  
Dehydroascorbic Acid ◽  
Side Chain ◽  
Bicyclic Structure ◽  
Spin Resonance

By comparing proton and electron spin resonance spec­tra of twofold and single oxidized ascorbate and acetylated derivatives therefrom it can be concluded that semidehy- droascorbate as well as dehydroascorbate are of bicyclic structure due to the formation of a furanose ring of their side chain.

FREE RADICALS OF BIOLOGICAL INTEREST: PART II. ELECTRON SPIN RESONANCE (ESR) SPECTRA OF 2537 A IRRADIATED AMINO ACIDS

1967 ◽  
Vol 45 (12) ◽  
pp. 1831-1839 ◽  
Author(s):  
W. F. Forbes ◽  
P. D. Sullivan
Keyword(s):  
Amino Acids ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Hydrogen Abstraction ◽  
Esr Spectra ◽  
Side Chain ◽  
Biological Interest ◽  
Spin Resonance ◽  
Cyclohexadienyl Radical ◽  
Secondary Radical

Polycrystalline amino acids, when irradiated with 2537 Å light, afford a variety of electron spin resonance signals. These signals are generally stable at room temperature for relatively long periods of time. For a number of the spectra obtained, there is evidence that more than one radical species contributes to the observed spectra. The signals obtained frequently differ from those obtained on exposure to ionizing radiation. The postulated species formed can often be visualized as being formed by effective hydrogen abstraction from the alkyl-substituted tertiary carbon atom or from the —OH, —SH or —NH group contained in the side chain. For L-phenylalanine a secondary radical is obtained, which is ascribed to a cyclohexadienyl radical.

Triarylmethyl Radicals. Synthesis and Electron Spin Resonance Studies of Sesquixanthydryl Dimer and Related Compounds

1967 ◽  
Vol 89 (9) ◽  
pp. 2054-2058 ◽  
Author(s):  
M. J. Sabacky ◽  
C. S. Johnson ◽  
R. G. Smith ◽  
H. S. Gutowsky ◽  
J. C. Martin
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Spin Resonance ◽  
Related Compounds ◽  
Triarylmethyl Radicals
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