Studies On Kinetics And Mechanisms Of Oxidation Of Special Functional Amino Acids And α-diols By Ag(Ⅲ) Complex

Oxidation of special functional amino acids(L-glutamine and sarcosine) and a-diols by bis(hydrogenperiodato)argentite(Ⅲ) complex anion ([Ag(HIO6)2]5-) have been carried out. Oxidation products have been identified and characterized by chemical methods and mass spectrometry. The oxidation kinetics is followed by conventional spectrophotometry in alkaline medium over a range of temperature. Through analysis of the oxidation products and kinetic data, coherent and consistent mechanistic pictures have been depicted.In an alkaline medium, the oxidation reaction displays an overall second-order kinetics: first-order to both Ag(Ⅲ) and Gln, respectively. The observed second-order rate constants (k'), decreasing with increasing [IO4-]tot and increasing with increasing the ionic strength, are virtually invariable with the variation of [OH-].In an alkaline medium, oxidation of a-diols, namely ethyl ene glycol,1,2-propanediol, and 1,2-butanediol, by [Ag(HIO6)2]5- is kinetically first-order with respect to the Ag(Ⅲ) complex kobs=kx[α-diol]+ky[α-diol]2...