Remarkable promation of the hydroxylation of thimine to give thimine glycol with almost complete depression of side reactions by 2,2,6,6-tetramethylpiperidine-1-oxyl (TMPO·) derivatives was observed in the γ-radiolyses of the N2- and N2O-saturated aqueous solutions. In the O2-saturated solution, TMPO· depressed the thymine conversion close to the level under N2 while promoted the formation of thymine glycol to some extent by decreasing side reactions.
The kinetics of the oxidation of certain biologically important pyrimidine bases (Uracil, Thymine, and 6-Methyluracil) by Ce(IV) in aqueous H2SO4 has been investigated. A first-order dependence of rate each on /Ce(IV)/. [pyrimidine], and an inverse first-order dependence on /H2SO4/ has been observed. Rate and activation parameters for the oxidation of these pyrimidines have been computed. A suitable rate law and a mechanism consistent with the kinetic observations and product analysis have been proposed. (C) 1996 John Wiley & Sons, Inc.
Yu, Tain-Jen; Sutherland, Ronald G.; Verrall, Ronald E., Canadian Journal of Chemistry, 1980, vol. 58, p. 1909 - 1915
作者:Yu, Tain-Jen、Sutherland, Ronald G.、Verrall, Ronald E.