Beyond Passive Substituents: Tosyl-Directed Self-Templation Enables Selective Pillar[4 + 1]arene Formation and Topology Switching. - Ruengsuk A; Khamphaijun K; Laoviwat P; Kamonsutthipaijit N; Tuntirungrotechai J; Shigeta Y; Hengphasatporn K; Harding DJ; Bunchuay T (Journal of the American Chemical Society, 2026)