Flash photolysis study for substituent and solvent effects on spin-trapping rates of phenylthiyl radicals with nitrones.
スポンサーリンク
概要
- 論文の詳細を見る
The spin-trapping rates for the reactions of para-substituted phenylthiyl radicals with nitrones have been determined by flash photolysis. For the phenylthiyl radical, the rate constant (in mol<SUP>−1</SUP> dm<SUP>3</SUP>s<SUP>−1</SUP>) in benzene for a cyclic nitrone, 5,5-dimethyl-1-pyrroline <I>N</I>-oxide, is 5.2×10<SUP>8</SUP>, which is greater than that for acyclic one, <I>N</I>-<I>t</I>-butyl-α-toluenimine <I>N</I>-oxide (1.1×10<SUP>7</SUP>). The rates decrease with the solvent polarity and with the hydrogen-bonding ability; the maximum ratio of <I>ca.</I> 30 is observed for the rates between cyclohexane and methanol. Combined with the observed substituent effects, the mechanisms of the reactions and properties of the transition states are discussed.
- 公益社団法人 日本化学会の論文
著者
-
Matsuda Minoru
Chemical Research Institute of Non-aqueous Solutions, Tohoku University
-
Matsuda Minoru
Chemical Research Institute of Nonaqueous Solutions, Tohoku University
-
Ito Osamu
Chemical Research Institute of Non-aqueous Solutions, Tohoku University
関連論文
- Cis- and Trans-Chlorination of Cyclohexene by Antimony Pentachloride and Triethyloxonium Hexachloroantimonate
- Flash photolysis study for substituent and solvent effects on spin-trapping rates of phenylthiyl radicals with nitrones.
- ESR and FT-IR studies for coal structures. Characteristics of Japanese Coals.
- Flash photolysis study on the addition reaction of alkylthiyl radical to olefins.
- Effects of alkali metal cation, solvent, and alkylating agent on the alkylation of alkali metal enolates of ethyl acetoacetate.
- Absolute rate constants for hydrogen abstraction from some aromatic hydrocarbons by p-chlorophenylthiyl radical.
- Kinetics of the Thermal Decompositions of Diaryl and Dialkyl Disulfides
- Electron-transfer reaction from sodium benzenethiolate to acceptors assisted by photo-excited tris(2,2'-bipyridine)ruthenium(II).
- Cation, solvent, and substituent effects on the optical spectra of alkali metal salts of arylthiolate anions.
- Studies of sulfonyl radicals. II. Relative reactivities of ddition reactions of sulfonyl free radicals to vinyl monomers.
- Studies of sulfonyl radicals. III. Solvent effects on the thermal decomposition of benzyl phenylazo sulfone.
- Synergistic effect of alcohol-benzene mixtures for coal extraction.
- Retardation Effect Induced by Pyridine in the Radical Copolymerization of Styrene and Liquid Sulfur Dioxide