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Kinetic and mechanistic investigations of the Baylis-Hillman reaction in ionic liquids

机译：离子液体中Baylis-Hillman反应的动力学和机理研究

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摘要

We report here a quantitative study of the kinetics and mechanism of the Baylis-Hillman reaction in the presence of ionic liquids as solvent media. Apparently, a simple Baylis-Hillman reaction can occur by two different exclusive mechanisms in ionic liquids. The delicate balance of these mechanisms is maintained by the ionic environment employed. The main features of the possible mechanism have been described here along with interesting kinetic consequences. The measurement of rate constants and activation energy parameters demonstrate that as the medium becomes basic, the order of the reaction changes from 1 to 2. An unexpected change in the mechanism of the reaction is observed with a change in the nature of the ionic liquid. The Linear Solvation Energy Relationship has also been used as an investigating tool to delineate the respective contributions of the cation and anion of the ionic liquid. The observation strongly dictates the dependency of the mechanism of the Baylis-Hillman reaction on the nature of the anion of the ionic liquids undertaken for this study.
机译：我们在此报告在离子液体作为溶剂介质存在下，Baylis-Hillman反应动力学和机理的定量研究。显然，一个简单的Baylis-Hillman反应可以通过两种不同的排他性机理在离子液体中发生。这些机制之间的微妙平衡由所采用的离子环境保持。可能机制的主要特征以及有趣的动力学后果已在此处进行了描述。速率常数和活化能参数的测量表明，随着介质变为碱性，反应的顺序从1变为2。随着离子液体性质的变化，观察到了反应机理的意外变化。线性溶剂能关系也已用作研究工具，描绘了离子液体中阳离子和阴离子的各自贡献。该观察强烈地表明了Baylis-Hillman反应机理对本研究所采用的离子液体阴离子性质的依赖性。

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