<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><sup>13</sup>C NMR spectrum of calix[4]arene sulfonic acid in D<sub>2</sub>O.</div>

International Journal of Medicinal Chemistry

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Figure 2

Figure 2: <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 2 | p-Sulfonic Acid Calix[4]arene as an Efficient Catalyst for One-Pot Synthesis of Pharmaceutically Significant Coumarin Derivatives under Solvent-Free Condition 