摘要
乙酰丙酮CH_2(COCH_3)_2(简写为Hacac)是重要的有机合成中间体,也是柠檬酸在人体内代谢的中间物.为了进一步掌握柠檬酸氧化的后续变化,我组观测了前人未曾报导过的乙酰丙酮与高锰酸钾在酸性介质中的快速反应.该反应从现象上可明显分为两个阶段:第一个阶段是MnO_4^-的紫色迅速消褪,反应体系转变为浅绿色溶液;第二阶段是浅绿溶液缓慢转变为无色.其中第一阶段的反应速率相当快.我组曾研制成功CFF-751G 型连续流动法快速反应装置,本工作采用该装置对上述第一阶段的快速反应进行了动力学研究.
The kinetics of the fast reaction between MnO_4^- and diacetone(Hacac)in acidicmedium has been studied by the continuous flow-spectrophotometric method.Thisreaction is second-order overall,and the order with respect to both MnO_4^- and Hacacis one.Activation energy E_α and preexponential factor A has been determined.E_α=4.91×10~4J·mol^(-1),A=9.75×10~9mol^(-1)·dm^3·s^(-1).and the relation between k and T isIn(k/mol^(-1)·dm^3·s^(-1))=23.0-5.91×10~3/(T/K).A possible mechanism of this fastreaction has been proposed.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1993年第5期692-697,共6页
Acta Physico-Chimica Sinica
关键词
快速反应
乙酰丙酮
高锰酸钾
Continuous-flow-spectrophotometric method
Fast reaction
KMnO_4
Diacetone
