Figure 3.

A) Synthesis of tris‐acetal 4 and its TFA catalyzed conversion into capsularene 1, with basket 2 forming as an intermediate. The condensation of tris‐anhydride and tris(methylamine)‐trioxane gave capsule 1 in 50 % yield. B) The coupling of tris‐imide 5 with tris(chloromethyl)‐trioxane gave no desired products. ORTEP plots (50 % probability) of X‐ray structures of tris‐imide basket 5 (top) and tris‐acetal basket 4 (bottom). C) ¹H NMR spectra (850 MHz, 298 K) of tris‐acetal basket 4 (CDCl₃) and capsularene 1 (CD₂Cl₂).