功能性硫醇化合物对活性酯的裂解:阳离子表面活性剂诱导的加速和时间依赖性效应

Q4 Chemical Engineering

分子催化 Pub Date : 1994-11-27 DOI:10.1016/S0304-5102(94)87047-0

Noureddine Krati, Alain Brembilla, Pierre Lochon

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引用次数: 2

摘要

在阳离子胶束(CTAB)存在下，研究了5(6)-n-烷基-2-甲乙基苯并咪唑对疏水性对硝基苯基酯的酯化活性。不同对(硫醇、酯)的总活性随时间的变化而变化。从一个非常快的过程(与在水醇介质中得到的酯分解速率常数相比)到一个缓慢过程的时间长度主要取决于表面活性剂的浓度，但也取决于硫醇和表面活性剂的链长。在pH值接近中性的快速反应过程中，这些硫醇的高反应性主要是由于涉及其中性形式的协同效应。

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Cleavage of active esters by functional thiol compounds: Acceleration and time-dependent effects induced by cationic surfactants

The esterolytic activity of 5(6)-n-alkyl-2-methanethiolbenzimidazoles towards hydrophobic p-nitrophenyl esters has been investigated in the presence of cationic micelles (CTAB). The overall activity of the different pairs (thiol, ester) is characterized by an important variation during the time. The length of time from a very fast process (in comparison with the esterolytic rate constants obtained in a hydro-alcoholic medium) to a slow one depends notably upon the surfactant concentration but also on both thiol and surfactant chain lengths. In the case of a rapid process at pH close to neutrality, the high reactivity of these thiols is essentially due to a cooperative effect involving their neutral form.

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来源期刊

分子催化 Chemical Engineering-Catalysis

CiteScore

1.50

自引率

0.00%

发文量

2959

期刊介绍： Journal of Molecular Catalysis (China) is a bimonthly journal, founded in 1987. It is a bimonthly journal, founded in 1987, sponsored by Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, under the supervision of Chinese Academy of Sciences, and published by Science Publishing House, which is a scholarly journal openly circulated both at home and abroad. The journal mainly reports the latest progress and research results on molecular catalysis. It contains academic papers, research briefs, research reports and progress reviews. The content focuses on coordination catalysis, enzyme catalysis, light-ribbed catalysis, stereochemistry in catalysis, catalytic reaction mechanism and kinetics, the study of catalyst surface states and the application of quantum chemistry in catalysis. We also provide contributions on the activation, deactivation and regeneration of homogeneous catalysts, solidified homogeneous catalysts and solidified enzyme catalysts in industrial catalytic processes, as well as on the optimisation and characterisation of catalysts for new catalytic processes. The main target readers are scientists and postgraduates working in catalysis in research institutes, industrial and mining enterprises, as well as teachers and students of chemistry and chemical engineering departments in colleges and universities. Contributions from related professionals are welcome.