Evidence for intermediates and a change in rate-limiting step in the aminolysis of the carcinogen N-methyl-N'-nitro-N-nitrosoguanidine by cyclic amines
作者:Desmond N. Wichems、Shimona Nag、Jane Mills、James C. Fishbein
DOI:10.1021/ja00049a016
日期:1992.11
stimulated by cyclic amines in aqueous solutions at 40 o C, ionic strength 1 M (KCl). Plots of κ obs against nucleophile are linear to a concentration of nucleophile up to 0.3 M. The slopes of the plots change as a function of pH. There is no evidence of significant buffer catalysis of the reactions in control experiments containing up to 0.5 M buffer
报告了 N-甲基-N'-硝基-N-亚硝基胍(在 40 o C 下由环胺在水溶液中激发的 M,离子强度 1 M (KCl))分解的速率常数和产物。κ obs 对亲核试剂的图与高达 0.3 M 的亲核试剂浓度呈线性关系。曲线的斜率随 pH 值而变化。在包含高达 0.5 M 缓冲液的对照实验中,没有证据表明反应具有显着的缓冲液催化作用