A Macrobicyclic Polyphenoxide as Receptor Analogue for Choline and Related Ammonium Compounds

Abstract

The long known condensation of resorcinol with acetaldehyde yields the tetraphenoxide H (RCH3). This bowl-shaped host compound is characterized by cyclic hydrogen bridges and delocalized negative charge, which leads to a high symmetry and stability and to the highest bonding constants known so far for methylammonium ions of the choline type and similar derivatives.