Evidence for the Formation of Acylated or Phosphorylated Monoperoxyphthalates in the Catalytic Esterolytic Reactions in Cationic Surfactant Aggregates
作者:Santanu Bhattacharya、Karnam Snehalatha
DOI:10.1021/jo961570d
日期:1997.4.1
(i) a micellar cetyltrimethylammonium chloride (CTACl) solution; (ii) an oil-in-water (O/W) microemulsion (ME) stabilized by CTACl, and a cosurfactant, tert-butyl alcohol, and (iii) a vesicular medium composed of dispersions of dihexadecyldimethylammonium chloride (DHDAC). At pH approximately 8.5 and 25 degrees C, each of these formulations was used to cleave p-nitrophenyl diphenyl phosphate (PNPDPP)
将单过氧邻苯二甲酸酯(MPP)溶解在三种不同的水性阳离子表面活性剂聚集体中,这些聚集体由(i)胶束十六烷基三甲基氯化铵(CTACl)溶液组成;(ii)用CTCCl稳定的水包油(O / W)微乳液(ME)和助表面活性剂叔丁醇,和(iii)由二十六烷基二甲基氯化铵(DHDAC)分散体组成的囊状介质。在约8.5和25℃的pH下,这些制剂中的每一个均用于裂解对硝基苯基二苯基磷酸酯(PNPDPP)。PNPDPP裂解的总和最大伪一阶速率常数([MPP] = 4 x 10(-)(5)M,[PNPDPP] = 1 x 10(-)(5)M)为以下:单独缓冲,0.00034 s(-)(1); 胶束:0.024 s(-)(1);ME:0.0048 s(-)(1);和囊泡:0.025 s(-)(1)。重要的是,所有催化配方均显示出“营业额” 存在过量底物时的行为。通过结合使用(1)H-和(31)P-NMR光谱法和