Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1266631 | Ultrasonics Sonochemistry | 2008 | 6 Pages |
Abstract
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-octahydroxanthene (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 any 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.
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Authors
K. Venkatesan, Suresh S. Pujari, R.J. Lahoti, K.V. Srinivasan,