The .GAMMA.-ray induced oxidation of aromatic hydrocarbons in liquid dinitrogen oxide.

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概要

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• The γ-ray induced oxidation of aromatic hydrocarbons has been studied in liquid dinitrogen oxide, mainly at −18°C. Various mixing ratios of dinitrogen oxide and four aromatic hydrocarbons have been examined. The main oxygen-containing products observed were the corresponding phenols and benzyl alcohols. The kinetic analysis showed that ionic species, probably N<SUB>2</SUB>O<SUP>−</SUP> ions, are the main precursors at low mole fractions of dinitrogen oxide and that oxygen atoms become important with an increase in the mole fraction. 1-Butene was used as a scavenger of oxygen atoms. The following rate constant ratios were obtained for the reactions of oxygen atoms and N<SUB>2</SUB>O<SUP>−</SUP> ions: <I>k</I>(O+toluene)/<I>k</I>(O+1-butene)=0.02, <I>k</I>(O+toluene)/<I>k</I>(O+benzene)=2.0, and <I>k</I>(N<SUB>2</SUB>O<SUP>−</SUP>+1-butene)/<I>k</I>(N<SUB>2</SUB>O<SUP>−</SUP>+toluene)=2.5. The relative rates for the formation of the corresponding phenols and benzyl alcohols through ionic reactions from aromatic hydrocarbons were obtained as follows: benzene, 1.0; toluene, 2.5; <I>p</I>-xylene, 2.2; 1,3,5-trimethylbenzene, 3.1. These values are quite different from the relative rate constants of the reactions of oxygen atoms with these aromatic hydrocarbons.

• 公益社団法人 日本化学会の論文

著者

• Karasawa Hidetoshi

  Department of Applied Physics, Tokyo Institute of Technology

• Yugeta Rei

  Department of Applied Physics, Tokyo Institute of Technology

• Sato Shin

  Department of Applied Physics, Tokyo Institute of Technology

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