Abstract
A simple and green approach to the esterification of p-hydroxybenzoic acid and aliphatic alcohols to obtain parabens was developed. First, two novel benzothiazole ionic liquids [HBth]H2PW12O40 (IL1) and [HBth]H4PMo12O41 (IL2) were synthesized with benzothiazole and heteropolyacids as starting materials. The synthesized ionic liquids were characterized by FTIR spectroscopy, TGA, PXRD analysis, and SEM. The application of IL1 and IL2 as catalysts for the synthesis of parabens was explored. The results showed that the ILs had a high catalytic activity in the synthesis of parabens, and, at the same time, they could be easily recovered and reused five times without loss of activity.
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ACKNOWLEDGMENTS
The authors are thankful to the Instrument Analysis Center, Shaanxi University of Science and Technology, for FTIR, TGA, SEM, and PXRD measurements. We are grateful for the financial support to the Natural Science Foundation of Shanxi Province (grant no. 2018JM7046).
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Yin, D., Sun, J., Liu, Y. et al. Novel Benzothiazole Ionic Liquids as Catalysts for the Synthesis of Parabens. Russ J Org Chem 56, 1476–1483 (2020). https://doi.org/10.1134/S1070428020050205
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DOI: https://doi.org/10.1134/S1070428020050205