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

Figure 4

(a) TEM images of nano-γ-Al₂O₃. (b) TEM images of sulfonic acid functionalized nano-γ-Al₂O₃.

(a)

(b)