Journal
JOURNAL OF THE IRANIAN CHEMICAL SOCIETY
Volume 6, Issue 4, Pages 710-714Publisher
SPRINGER
DOI: 10.1007/BF03246160
Keywords
Coumarin; Microwave irradiation; beta-Dicarbonyl C-H acid; Ionic liquid
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Coumarin derivatives were synthesized in relatively high yields via Knoevenagel condensation reaction of an ortho-hydroxyaryl aldehyde and an activated beta-dicarbonyl C-H acid in the presence of a recyclable ionic liquid 1,1,3,3-N,N,N',N'-tetramethylguanidinium trifluoroacetate under either classical heating conditions or using microwave irradiation. Application of microwave irradiation decreased the required time by a factor of about 200. The ionic liquid could be recycled several times without loss of efficiency with regards to the reaction times and yields.
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