Silica-ZnCl<sub><b>2</b></sub>: An Efficient Catalyst for the Synthesis of 4-Methylcoumarins

<table>Olson’s proposed structure of silica-ZnCl<sub>2</sub>.</table>

International Scholarly Research Notices

Figure 1: Silica-ZnCl<sub><b>2</b></sub>: An Efficient Catalyst for the Synthesis of 4-Methylcoumarins 