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- Title
A Solvent-Free Synthesis of Coumarins Using Phosphotungstic Acid as Catalyst.
- Authors
Keri, Rangappa S.; Hosamani, Kallappa M.; Reddy, Harisha R. Seetharama
- Abstract
Phosphotungstic acid (PTA) is used an efficient catalyst for the von Pechmann condensation reaction of phenols and β-keto esters under solvent-free conditions. This method was compared with those of the reactions in the different solvents and catalysts. The methodology presented offers significant improvements for the synthesis of coumarins with regard to yield of products, simplicity in operation and green aspects by avoiding toxic conventional catalysts and solvents. Phosphotungstic acid (PTA) is used an efficient catalyst for the von Pechmann condensation reaction of phenols and β-keto esters under solvent-free conditions. This method was compared with those of the reactions in the different solvents and catalysts. The methodology presented offers significant improvements for the synthesis of coumarins with regard to yield of products, simplicity in operation and green aspects by avoiding toxic conventional catalysts and solvents.[Figure not available: see fulltext.]
- Subjects
SOLVENTS; COUMARINS; TUNGSTIC acid; CATALYSTS; CHEMICAL reactions
- Publication
Catalysis Letters, 2009, Vol 131, Issue 1/2, p321
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-009-9940-z