Reactions of carbonyl compounds in basic solutions. Part 14. The alkaline hydrolysis of substituted N-methylformanilides, N-methylacetanilides, 1-phenylazetidin-2-ones, 1-phenyl-2-pyrrolidones, and 1-phenyl-2-piperidones
作者:Keith Bowden、Keith Bromley
DOI:10.1039/p29900002103
日期:——
in aqueous dimethyl sulphoxide and in aqueous dioxane or water have been measured at several temperatures. The reactions were first order in substrate and, for the lactams and acetanilides, first order in base and, for the formanilides, both first and second order in base. Hammett reaction constants and activation parameters have been evaluated for each system. The relative reactivity, salt, solvent
一系列取代的1-苯基氮杂环丁烷-2-酮,-2-吡咯烷酮和-2-哌啶酮以及N-甲基乙酰苯胺和N的碱水解速率系数已经在几个温度下测量了在二甲基亚砜水溶液和在二恶烷或水中的α-甲基甲酰苯胺。该反应在底物中是一阶的,对于内酰胺和乙酰苯胺而言,该反应是在碱中的一阶,对于甲酰苯胺,在碱中是一阶和二阶。已对每个系统评估了Hammett反应常数和活化参数。已经检查了相对反应性,盐,溶剂和溶剂同位素效应。建议了以下反应机理。对于β-内酰胺,途径似乎是氢氧化物的速率决定性攻击,而对于γ-和δ-内酰胺和乙酰苯胺而言,碳-氮键的速率决定裂变是在碱的平衡添加之后发生的。通过确定水催化或碱催化的速率。