• Title/Summary/Keyword: chromyl

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Chromic Anhydride-Chlorosilanes. An Application to Benzylic Oxidation

  • Jong Gun Lee;Dong Soo Ha
    • Bulletin of the Korean Chemical Society
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    • v.12 no.2
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    • pp.149-153
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    • 1991
  • Chlorotrimethylsilane reacts with chromic anhydride to form a very reactive neutral chromium (Ⅵ) oxidizing agent. The active oxidizing species is not trimethylsilyl chlorochromate as was previously reported but chromyl chloride generated in equilibrium concentration. This oxidizing agent was proved very suitable for benzylic oxidations of toluenes and alkylbenzenes to benzaldehydes and aralkyl ketones. Dichlorodimethylsilane and trichlormethylsilane also react with chromic anhydride to form chromyl chloride in an equilibrium concentration.

Kinetic Studies of Chromium-Oxygen Complex (산소를 포함한 크롬화합물에 대한 속도론적 연구)

  • Won, Tae-Jin;Lee, Yong-Ill;Kim, Dong-Won
    • Analytical Science and Technology
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    • v.12 no.5
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    • pp.460-463
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    • 1999
  • The kinetics for the reaction of superoxo chromium(III), $CrO{_2}^{2+}$ and glutathione(GSH) have been studied spectrophotometically in aqueous solution. Because the reaction is slow under our experimental conditions the initial rate method is used. Also the reaction fit in second order kinetics. Glutathione is oxidized by chromium complex containing oxygen. The rates of reactions depend on the presence of alcohol(MeOH or 2-PrOH) and oxygen. From these observations it is suggested the real oxidant for glutathione is not superoxo chromium, $CrO{_2}^{2+}$ but chromyl, $CrO^{2+}$.

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