ethers were examined. A Bronsted plot of the logarithm of the second-order rate constant k TFE for reaction with trifluoroethanol against the pK LG is not linear. The nonlinear plot might be taken as evidence for a change in rate-determining step of a reaction that proceeds through a pentavalent intermediate. However, the Bronsted plot for the hydroxide-catalyzed hydrolysis, where all the leaving groups
研究了
三氟乙醇催化的
三氟乙醇分解和氢氧化物催化的一系列苯基二甲基甲
硅烷基醚的
水解。与
三氟乙醇反应的二阶速率常数 k
TFE 对 pK LG 的对数的布朗斯台德图不是线性的。非线性图可以作为通过五价中间体进行的反应的速率决定步骤发生变化的证据。然而,氢氧化物催化
水解的布朗斯台德图,其中所有离去基团的 pKa 低于氢氧化物,与
三氟乙醇解反应的布朗斯台德图具有相同的形状