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Acidic functionalized ionic liquids as catalyst for the isomerization of α-pinene to camphene

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Abstract

An acidic functionalized ionic liquids (ILs) [HSO3-(CH2)3-NEt3]Cl-ZnCl2 was synthesized and used to catalyze the isomerization of α-pinene in a homogeneous system. The optimum conditions for isomerization were obtained as follows: n(α-pinene):n(ILs) = 9:1, reaction temperature 140 °C, and reaction time 4 h, α-pinene 0.04 mol. Under the optimal conditions, the conversion of α-pinene was 97.6 % and the selectivity for camphene could reach 64.8 %. In addition, the catalyst could be easily separated by centrifugation after the isomerization completely finished. When the ILs were repeatedly used for four times, the conversion of α-pinene and the selectivity for camphene were still excellent, indicating the superb recycle ability of the acidic functionalized ILs catalyst.

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Acknowledgments

The financial support provided for this research by the National Natural Science Foundation of China (31000275) and Postdoctoral Science Foundation of China (201104582) is gratefully acknowledged.

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Authors and Affiliations

  1. Key Laboratory of Eco-chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, People’s Republic of China

    Yue Liu & Cong Xia Xie

  2. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, People’s Republic of China

    Lu Li

Authors
  1. Yue Liu
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  2. Lu Li
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  3. Cong Xia Xie
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Correspondence to Cong Xia Xie.

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Liu, Y., Li, L. & Xie, C.X. Acidic functionalized ionic liquids as catalyst for the isomerization of α-pinene to camphene. Res Chem Intermed 42, 559–569 (2016). https://doi.org/10.1007/s11164-015-2041-2

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