A Fast, Highly Efficient, and Green Protocol for Synthesis of Biscoumarins Catalyzed by Silica Sulfuric Acid Nanoparticles as a Reusable Catalyst

<table>Synthesis of biscoumarins by condensation of 4-hydroxycoumarin with an aromatic aldehyde or phenylglyoxals using SiO<sub>2</sub>-OSO<sub>3</sub>H NPs as catalyst.</table>

Journal of Chemistry

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Scheme 1

Scheme 1: A Fast, Highly Efficient, and Green Protocol for Synthesis of Biscoumarins Catalyzed by Silica Sulfuric Acid Nanoparticles as a Reusable Catalyst 

Scheme 1 | A Fast, Highly Efficient, and Green Protocol for Synthesis of Biscoumarins Catalyzed by Silica Sulfuric Acid Nanoparticles as a Reusable Catalyst 