单一和混合胶束溶液中乙酰苯胺碱性水解反应动力学  

KINETICS OF ALKALINE HYDROLYSIS OF ACETANILIDE IN SINGLE AND MIXED MICELLAR SOLUTZONS

作　　者：孟祥光[1] 肖淑兴[1] 陈民助[1] 秦自明[1] 曾宪诚[1] 胡启山 

机构地区：[1]四川大学化学系 [2]达县师专化学系

出　　处：《四川大学学报（自然科学版）》1997年第5期648-655,共8页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金

摘　　要：根据Ｂｅｅｒ定律和不可逆与可逆连续一级反应动力学方程，建立了不可逆与可逆连续一级反应体系溶液的吸光度方程．在４０℃下乙腈水溶液中，用紫外分光光度法研究了单一和混合胶束及功能分子对乙酰苯胺碱性水解反应的催化作用．应用自函数回归法得到反应的动力学混合参数λ１和λ２，由λ１和λ２求得了反应的动力学参数ｋ１，ｋ－１，ｋ２，ｋ３．ＣＴＡＢ和ＳＤＳ胶束，ＣＴＡＢ／ＢＨＭＩ，ＳＯＳ／ＢＨＭＩ混合胶束和功能分子２－羟甲基苄基咪唑溶液，对该反应有催化作用，Ｂｒｉｊ３５胶束溶液对该反应无明显影响，苯甲羟肟酸溶液对该反应有抑制作用．Based on Beer′s law and kinetic equations of reversible and irreversible consecutive first order reactions,absorbance equations for solutions of reversible and irreversible consecutive first order reactions have been developed.The catalysis of single and mixed micelles and functional molecules for alkaline hydrosis of acetanilide has been studied at 40℃ in aqueous acetonitrile solution with UV spectrophotometry.The kinetic mixed parameters, λ 1 and λ 2, of the reaction have been obtain with self function regression method.The kinetic parameters, k 1,k -1 ,k 2,k 3, of different steps in the reaction course have been calculated from λ 1 and λ 2 at different initial concentrations of reactants.The results indicate that this reaction is catalyzed by single micelles (CTAB,SDS) and functional molecule (1 benzyl 2 hydroxymethylimidazole(BHMI) and mixed micelles (CTAB/BHMI,SDS/BHMI),and nearly not influenced by Brij35,but inhibited by benzohydroxamic acid.The extent of catalysis for the reaction in the mixed micellar solutions is greater than that in single micellar solutions and in functional melecular solutions.

关 键 词：乙酰苯胺 碱性水解 混合胶束 水解反应 动力学 

分 类 号：O625.632[理学—有机化学]