Rate-determining carbonyl hydration in the intramolecular hydrolysis of phenacyl phosphonate esters: isotopic probes and activation parameters
作者:Ildiko M. Kovach、Qinjian Zhao、Matthew Keane、Rachel Reyes
DOI:10.1021/ja00076a001
日期:1993.11
with alkoxy substituents not containing a β-carbonyl group. This is consistent with an intramolecular displacement of 4-nitrophenol by the anion of the carbonyl hydrate. 18 O incorporation into the hydrolysis product of the 4-CH 3 derivative from H 2 18 O in alkaline solution is 5 indicates a rapid protonic equilibrium between the carbonyl hydrate and the medium but slower equilibration of the carbonyl
4-硝基苯基 4-取代苯甲酰基甲基膦酸酯(CH 3 、H、CH 2 O、NO 2 和 Cl)在水性缓冲液中的分解速度比具有不含 β-羰基的烷氧基取代基的类似物快 1-4 个数量级。这与羰基水合物的阴离子对 4-硝基苯酚的分子内置换是一致的。18 O 结合到碱性溶液中 H 2 18 O 的 4-CH 3 衍生物的水解产物中是 5 表明羰基水合物和介质之间的快速质子平衡,但羰基 O 与介质的平衡比环化慢