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

Figure 2

XRD patterns of nano-γ-Al₂O₃ (up) and sulfonic acid functionalized nano-γ-Al₂O₃ (down).