One-pot conversion of cyclohexanol to ε-caprolactam using a multifunctional Na2WO4-acidic ionic liquid catalytic system

doi:10.1016/S1872-2067(16)62563-9

Abstract

Abstract:

Na₂WO₄-acidic ionic liquid was used as a simple, ecofriendly, recyclable and efficient catalytic sys-tem for the one-pot conversion of cyclohexanol to ε-caprolactam. The effect of the structure of the ionic liquid on the catalytic activity of this system was investigated, and the results revealed that sulfonic acid-functionalized ionic liquids with HSO₄^- as an anion gave the best results. The highly efficient performance of this catalyst system was attributed to the phase-transfer behavior of the cation of the ionic liquid, the improved coordination of the substrate to bisperoxotungstate during the oxidation reaction, and the stabilization of the intermediate formed during the Beckmann rear-rangement.

Key words: Cyclohexanol, ε-Caprolactam, One-pot synthesis, Acidic ionic liquid, Cyclohexanone oxime

Hefang Wang, Liyuan Ji, Rongbin Hu, Meidan Gao, Yanji Wang. One-pot conversion of cyclohexanol to ε-caprolactam using a multifunctional Na₂WO₄-acidic ionic liquid catalytic system[J]. Chinese Journal of Catalysis, 2017, 38(1): 58-64.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(16)62563-9

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One-pot conversion of cyclohexanol to ε-caprolactam using a multifunctional Na₂WO₄-acidic ionic liquid catalytic system

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