1. 1a) Presented at the 13th International Symposium on Macrocyclic Chemistry, Hamburg (FRG), Sept. 4–8, 1988.
2. 1b) – Presented at the 5th International Conference on Inclusion Phenomena and Molecular Recognition, Orange Beach, Alabama (USA), Sept. 18–23, 1988.
3. Concave Reagents, 1: Ulrich Lüning, Liebigs Ann. Chem. 1987, 949.
4. Dissociation Constants of Organic Bases in Aqueous Solutions, Butterworth, London, 1965; Supplement 1972.
5. The distances were calculated assuming perfect hexagons for the aromatic rings with bond lengths of 1.39 Å. For the distance CH3 – aromatic ring, a bond length of 1.44 Å was chosen and all angles were assumed to be 120°.