Sulfonic Acid Functionalized Nano-γ-Al2O3: A New, Efficient, and Reusable Catalyst for Synthesis of 3-Substituted-2H-1,4-Benzothiazines

<table>Reusability of sulfonic acid functionalized nano-γ-Al2O3 synthesis of 3-phenyl-2H-1,4-benzothiazine.</table>

The Scientific World Journal

Figure 5: Sulfonic Acid Functionalized Nano-γ-Al2O3: A New, Efficient, and Reusable Catalyst for Synthesis of 3-Substituted-2H-1,4-Benzothiazines