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Reaction of aromatic aldehydes and dimedone was efficiently promoted by the TiO2 as a catalyst in acetonitrile at room temperature under ultrasonic irradiation to afford the corresponding 9-aryl-1,8-dioxo-octahydroxanthene in excellent yields within minutes. However, the same reaction, without catalyst, yielded the corresponding 2,2'-arylmethylenebis(3-hydroxy- 5,5-dimethyl-2-cycloexene-1-one). Study with various aldehydes and dimedone reveals that ultrasound and TiO2 plays a key role in the synthesis of 9-aryl-1,8-dioxo-octahydroxanthene.

Ultrasound-Promoted Synthesis of 9-Aryl-l,8-dioxo-octahydroxanthenes Using TiO2 as a Cheap and Reusable Catalyst