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  • Title: Ultrasound-promoted greener synthesis of 2H-chromen-2-ones catalyzed by copper perchlorate in solventless media.
    Author: Puri S, Kaur B, Parmar A, Kumar H.
    Journal: Ultrason Sonochem; 2009 Aug; 16(6):705-7. PubMed ID: 19423380.
    Abstract:
    Copper perchlorate is found to be a heterogeneous catalyst for an efficient and greener synthesis of 4-substituted 2H-chromen-2-ones via von Pechmann condensation of substituted phenols and beta-keto esters in solventless media with excellent yields using ultrasound irradiation. The present methodology offers several advantages such as excellent yields, simple procedure and milder conditions.
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