Journal
RESEARCH ON CHEMICAL INTERMEDIATES
Volume 41, Issue 9, Pages 6207-6218Publisher
SPRINGER
DOI: 10.1007/s11164-014-1733-3
Keywords
Coumarin; Ionic liquid; Catalyst; Von Pechmann condensation; Solvent-free synthesis
Categories
Funding
- Guilan University Research Council
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1,3-Disulfonic acid imidazolium hydrogen sulfate has been used as an effective and reusable ionic liquid catalyst for the synthesis of coumarins from phenol derivatives with beta-ketoesters via the Von Pechmann condensation under solvent-free conditions. This method consistently has the advantages of excellent yields, easy and quick isolation of the products, short reaction times, and green aspects by avoiding toxic catalysts and solvents. Further, the catalyst can be recovered and reused for four times without loss of activity.
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