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Application of chloroaluminate ionic liquid as catalyst and medium for the dealkylation of esters

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Abstract

Dealkylation of esters to carboxylic acids was performed using chloroaluminate ionic liquids (PyHBr/AlCl3, PyHCl/AlCl3, Me3NHCl/AlCl3, Et3NHCl/AlCl3) as catalyst and medium. The catalytic activity of PyHBr/AlCl3 (X(AlCl3) = 0.67) proved to be superior to the other three ionic liquids for the dealkylation of methyl benzoate with a conversion of 97% after 3 h at 140 °C. After easy separation from the products the ionic liquid PyHBr/AlCl3 could be reused six times without loss of its activity.

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Acknowledgments

We are grateful to the Nature Science Foundation of Hubei Province (No. 2007ABA279) and Foundation of Hubei Educational Commission (No. B20111702) for financial support.

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Authors and Affiliations

  1. School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, 430023, China

    Ben-Mei Wei, Zhi-Yong Zhang, Zhi-Qun Dai & Kai-Cheng Zhang

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  1. Ben-Mei Wei
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  2. Zhi-Yong Zhang
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  3. Zhi-Qun Dai
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  4. Kai-Cheng Zhang
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Correspondence to Ben-Mei Wei.

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Wei, BM., Zhang, ZY., Dai, ZQ. et al. Application of chloroaluminate ionic liquid as catalyst and medium for the dealkylation of esters. Monatsh Chem 142, 1029–1033 (2011). https://doi.org/10.1007/s00706-011-0560-0

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  • DOI: https://doi.org/10.1007/s00706-011-0560-0

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