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.
Original language | English (US) |
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Pages (from-to) | 548-553 |
Number of pages | 6 |
Journal | Ultrasonics Sonochemistry |
Volume | 15 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2008 |
Bibliographical note
Funding Information:K.V. thanks the UGC, New Delhi for providing a Research Fellowship.
Keywords
- Aldehydes
- Ambient conditions
- Brønsted acidity
- Dimedone
- Ionic liquid
- Ultrasound
- Xanthenes