Kinetics and mechanism of oxidation of the drug mephenesin by bis(hydrogenperiodato)argentate(III) complex anion
作者:Shigang Shen、Hongmei Shi、Hanwen Sun
DOI:10.1002/kin.20260
日期:2007.8
with first order in [Ag(III)] and [mephenesin]. The effects of [OH−] and periodate concentration on the observed second-order rate constants k′ have been analyzed, and accordingly an empirical expression has been deduced: k′ = (ka + kb[OH−])K1/f([OH−])[IO−4]tot + K1}, where [IO−4]tot denotes the total concentration of periodate, ka = (1.35 ± 0.14) × 10−2M−1s−1 and kb = 1.06 ± 0.01 M−2s−1 at 25.0°C,
Mephenesin 被用作中枢作用的骨骼肌松弛剂。已经在水性碱性介质中研究了双(过碘氢)银酸(III)络合物阴离子 [Ag(HIO6)2]5- 对美芬辛的氧化作用。mephenesin 的主要氧化产物已通过质谱法鉴定为 3-(2-methylphenoxy)-2-ketone-1-propanol。在 [Ag(III)] 和 [mephenesin] 中观察到整体二级动力学。分析了[OH-]和高碘酸盐浓度对观测到的二阶速率常数k'的影响,并据此推导出经验表达式:k' = (ka + kb[OH-])K1/f( [OH−])[IO−4]tot + K1},其中[IO−4]tot 表示高碘酸盐的总浓度,ka = (1.35 ± 0.14) × 10−2M−1s−1 和 kb = 1.06 ± 0.01 M-2s-1 在 25.0°C,离子强度 0.30 M。已经计算了与 ka 和 kb 相