Triple Helicate Constructed by Covalent Bondings: Crystal Structure and Effective Synthesis Based on Propeller-like Substructures

A triple helicate, having a macrocyclic aromatic amide structure, was synthesized in high yield because of a preorganized component of the
tertiary benzenetrianilide moieties in a propeller-like syn conformation at both ends. The helicity was derived from tilted T-shaped aromatic−aromatic (CH−π) interactions between each of the N-phenyl rings.