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Simple protic ionic liquid [Et3NH][HSO4] as a proficient catalyst for facile synthesis of biscoumarins

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Abstract

We have explored a number of protic ionic liquids (PILs) as a catalyst for the synthesis of biscoumarins by condensation of 4-hydroxycoumarin with an aromatic aldehyde. Methylimidazolium- and triethylammonium-based PILs were synthesized by simple neutralization reaction with protic acids. Triethylammonium hydrogen sulfate [Et3NH][HSO4] was found to be the best among the studied PILs concerning the yield of products and reaction time period. Different biscoumarin derivatives were synthesized based on 4-hydroxycoumarin and various substituted aromatic aldehydes at optimum reaction conditions. Obtained products were separated just by simple filtration. The facile method does not require additional purification for formed products. The catalyst has shown better yields along with outstanding recyclability, providing an environmental benign protocol for the synthesis of biscoumarin derivatives.

Graphical Abstract

Screening of simple protic ionic liquids as a catalyst in the synthesis of biscoumarins, out of which [Et3NH][HSO4] was found to be best among the studied PILs.

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Acknowledgements

Authors SKP and MMV under UGC-BSR Meritorious Students fellowship and SCB under RGNF are grateful to the University Grants Commission (UGC), India, for financial support and DST-FIST, New Delhi, India, for instrument facilities at the Department of Chemistry, Shivaji University, Kolhapur.

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Correspondence to Sanjay S. Kolekar.

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Patil, S.K., Awale, D.V., Vadiyar, M.M. et al. Simple protic ionic liquid [Et3NH][HSO4] as a proficient catalyst for facile synthesis of biscoumarins. Res Chem Intermed 43, 5365–5376 (2017). https://doi.org/10.1007/s11164-017-2932-5

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