Acidic Ionic Liquids as Efficient and Environmentally Benign Medium for the Synthesis of 2-Phenylbenzimidazole |
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Authors: | Xinxin Gong Yuanyuan Wang Yu Wang Liyi Dai |
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Institution: | Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Chemistry Department of East China Normal University, Shanghai 200062, China |
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Abstract: | 2‐Substituted benzimidazoles have been synthesized in excellent yields under solvent‐free conditions using a series of acidic ionic liquids as catalysts. The results indicate that SO3H‐functionalized ionic liquids show higher catalytic activities than other acidic ionic liquids. The effects of reaction conditions such as the amounts of ionic liquids, the ratio of reactants were investigated. A Hammett method was used to determine the acidity order of these ionic liquids and the results were found to be relevant to the catalytic activities observed in the synthesis reaction. Besides, the reaction mechanism was stimulated using DFT method. |
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Keywords: | 2‐phenylbenzimidazole ionic liquids acidity characterization densty functional theory (DFT) |
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