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  • Chem Sci Trans., 2014, 3(2),  pp 652-663  

    DOI:10.7598/cst2014.783

    Research Article

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

  • SHWETA KUMARI, AMIYA SHEKHAR and DEVENDRA D. PATHAK
  • Department of Applied Chemistry, Indian School of Mines, Dhanbad-826004, Jharkhand, India
  • Abstract

    Reaction of aromatic aldehydes and dimedone was e?ciently promoted by the TiO2 as a catalyst in acetonitrile at room temperature under ultrasonic irradiation to a?ord 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.

    Keywords

    Aldehydes, Dimedone, Ultrasound, Xanthene derivatives, TiO2

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