<i>p</i>-Sulfonic Acid Calix[4]arene as an Efficient Catalyst for One-Pot Synthesis of Pharmaceutically Significant Coumarin Derivatives under Solvent-Free Condition

<div>Efficiency of the calixarene sulfonic acid (CSA) in the synthesis of coumarins.</div>

International Journal of Medicinal Chemistry

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Figure 4

Figure 4: <i>p</i>-Sulfonic Acid Calix[4]arene as an Efficient Catalyst for One-Pot Synthesis of Pharmaceutically Significant Coumarin Derivatives under Solvent-Free Condition 

Figure 4 | p-Sulfonic Acid Calix[4]arene as an Efficient Catalyst for One-Pot Synthesis of Pharmaceutically Significant Coumarin Derivatives under Solvent-Free Condition 