Effects of [NaOH] and [KBr] on Intramolecular General Base-Catalyzed Methanolysis of Ionized Phenyl Salicylate in the Presence of Cationic Micelles
作者:M. Niyaz Khan
DOI:10.1021/jo9619239
日期:1997.5.1
Pseudo-first-order rate constants obtained for methanolysis of ionized phenyl salicylate (PS(-)) at constant [MeOH], [MeCN], [NaOH] or [KOH], and [KBr] and at 35 degrees C show a decrease with the increase in [CTABr] (where CTABr represents cetyltrimethylammonium bromide) from 0.0-0.01 M. These observed data obey a pseudophase model of the micelle. The micellar binding constants (K(S)) of PS(-), pseudo-first-order
在常数[MeOH],[MeCN],[NaOH]或[KOH]和[KBr]以及在35摄氏度下,甲醇化离子化水杨酸苯酯(PS(-))的拟一级反应速率常数降低[CTABr](其中CTABr代表十六烷基三甲基溴化铵)从0.0-0.01 M增加。这些观察到的数据服从胶束的假相模型。PS(-)的胶束结合常数(K(S)),胶束伪相和cmc中PS(-)甲醇分解的伪一级速率常数(k(M))几乎不变。 NaOH]从0.005-0.050M。在0.01 M KOH下[KBr]从0.0增加到0.3 M,K(S)从5140减少到653 M(-)(1),cmc从1.9 x 10(-)(4) )到0.2 x 10(-)(4)M。伪一阶速率常数k(M)在0.01 M KOH时几乎与[KBr]无关。