Influence of the glucosylated β-cyclodextrin inclusion on sulfur trioxide spin-adduct stabilizations and spin-trapping rate processes for DMPO-type spin traps

2009 ◽  
Vol 66 (3-4) ◽  
pp. 357-364 ◽  
Author(s):  
Yoshimi Sueishi ◽  
Atsushi Miyata ◽  
Daisuke Yoshioka ◽  
Masato Kamibayashi ◽  
Yashige Kotake
Keyword(s):  
Sulfur Trioxide ◽  
Spin Trapping ◽  
Spin Adduct ◽  
Trapping Rate ◽  
Spin Traps ◽  
Cyclodextrin Inclusion ◽  
Rate Processes

Spin trapping by use of nitrosodurene and its derivatives

1982 ◽  
Vol 60 (12) ◽  
pp. 1532-1541 ◽  
Author(s):  
Ryusei Konaka ◽  
Shigeru Terabe ◽  
Taiichi Mizuta ◽  
Shigeru Sakata
Keyword(s):  
Hydrogen Peroxide ◽  
Esr Spectra ◽  
Spin Trapping ◽  
Nitroso Compounds ◽  
Spin Adduct ◽  
Spin Traps ◽  
Spectral Pattern ◽  
Alkyl Radicals ◽  
Alkyl Hydroperoxides ◽  
Tert Butyl Hydroperoxide

In spin trapping the N-methyl-N-phenylaminomethyl radical with nitrosodurene, an esr spectmm exhibiting line width alternation was observed despite the normal spectral pattern found with the use of nitroso-tert-butane. Nitrosodurene derivatives, N-duryl nitrone and methyl N-duryl nitrone, have been revealed to be other excellent spin traps for the N-, 0-, and S-centered radicals. Spin adducts of these radicals, which can be independently prepared by spin trapping with nitrosodurene, are stable and can be easily discriminated by large differences in β-hydrogen splittings or characteristic patterns. Methyl N-duryl nitrone reacted with tert-butyl hydroperoxide to give a spin adduct which could be clearly distinguished in the esr spectra from the tert-butoxy adducts prepared independently from other sources. Accordingly, it seems to be the tert-butylperoxy adduct. Similarly, hydrogen peroxide gave a different spectrum from the hydroxy adducts. Alkyl hydroperoxides caused molecule-induced homolysis with the nitroso compounds to produce alkoxy adducts of the respective nitroso compounds. Some phenyl and duryl alkoxy nitroxides undergo decomposition to give alkyl radicals which were trapped by the nitroso compounds.

Effects of Substituent and External Pressure on Spin Trapping Rates of Carbon Dioxide Anion, Sulfur Trioxide Anion, Hydroxyl, and Ethyl Radicals with Various PBN- and DMPO-Type Spin Traps

2014 ◽  
Vol 228 (9) ◽  
Author(s):  
Yoshimi Sueishi ◽  
Keitaro Miyazono ◽  
Kazuki Kozai
Keyword(s):  
Carbon Dioxide ◽  
Sulfur Trioxide ◽  
External Pressure ◽  
Spin Trapping ◽  
Spin Traps ◽  
Trapping Method ◽  
Ethyl Radicals

AbstractUsing a competitive trapping method employing two different traps, the trapping rates of anionic radicals (CO

Kinetic Evaluation of Spin Trapping Rate Constants of New CYPMPO-type Spin Traps for Superoxide and Other Free Radicals

2015 ◽  
Vol 229 (3) ◽  
Author(s):  
Yoshimi Sueishi ◽  
Erisa Kamogawa ◽  
Hideo Nakamura ◽  
Mitsuko Ukai ◽  
Michio Kunieda ◽  
...  
Keyword(s):  
Free Radicals ◽  
Rate Constants ◽  
Spin Trapping ◽  
Trapping Rate ◽  
Kinetic Evaluation ◽  
Spin Traps

AbstractCYPMPO (5-(2,2-dimethyl-1,3-propoxyl cyclophosphoryl)-5-methyl-1-pyrroline

scholarly journals Use of isotopically labelled spin-traps to determine definitively the presence or absence of non-radical addition artefacts in EPR spin-trapping systems

Redox Report ◽  
1997 ◽  
Vol 3 (2) ◽  
pp. 125-133 ◽  
Author(s):  
G. S. Timmins ◽  
G. K. Barlow ◽  
J. A. Silvester ◽  
X. Wei ◽  
A. C. Whitwood
Keyword(s):  
Spin Trapping ◽  
Radical Addition ◽  
Spin Traps ◽  
Epr Spin Trapping

Enhanced Spin-capturing Polymerization and Radical Coupling Mediated by Cyclic Nitrones

2012 ◽  
Vol 65 (8) ◽  
pp. 1110 ◽  
Author(s):  
Kayte Ranieri ◽  
Matthias Conradi ◽  
Pierre-Yves Chavant ◽  
Veronique Blandin ◽  
Christopher Barner-Kowollik ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Strong Dependence ◽  
Monomer Conversion ◽  
Functional Polymers ◽  
Spin Trapping ◽  
Coupling Reactions ◽  
Trapping Rate ◽  
Cyclic Nitrones ◽  
Radical Coupling ◽  
Addition Rate

A series of cyclic nitrones have been tested for their spin-trapping activity in the enhanced spin-capturing polymerization of styrene and in nitrone-mediated radical coupling reactions. rac-2-Isopropyl-2,3-dimethyl-1-oxy-2,3-dihydro-imidazol-4-one was found to be the most efficient nitrone. The specific polystyrene macroradical addition rate to this nitrone was determined to be 8.0 × 103 L mol–1 s–1, which is by a factor of 10 higher than for previously studied compounds. Via enhanced spin-capturing polymerization, polymers in the range of oligomers to 30000 g mol–1 were obtained. A strong dependence of molecular weight on monomer conversion was observed, which can be explained by the high trapping rate. In nitrone-mediated radical coupling, almost ideal coupling of bromine-functional polymers was obtained and the successful introduction of the residual alkoxyamine functionality confirmed.

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