Journal
ULTRASONICS SONOCHEMISTRY
Volume 15, Issue 4, Pages 548-553Publisher
ELSEVIER
DOI: 10.1016/j.ultsonch.2007.06.001
Keywords
aldehydes; dimedone; xanthenes; ionic liquid; Bronsted acidity; ultrasound; ambient conditions
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The condensation reaction involving an aldehyde and diketone was efficiently promoted by the Ionic liquid, [Hbim]BF4 (IL) as a reaction medium with methanol as co-solvent at ambient temperature under ultrasonic irradiation to afford the corresponding 1,8-dioxo-octahydroxantliene (xanthene) derivatives in excellent yields. The advantages of this method include among others the use of a recyclable, non-volatile ionic liquid, which promotes this protocol under ambient temperature without the requirement of ally added catalyst. The reaction times and yields are compared with p-TSA catalyzed synthesis of xanthenes under thermal conditions, which is also reported for the first time under our reaction conditions. (c) 2007 Elsevier B.V. All rights reserved.
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