Synthesis and X-ray crystal structures of three isomeric macrobicyclic polyethers having similar melting points and different complexing power for alkali-metal cations

Abstract

Three isomeric macrobicyclic polyethers, C₂₈H₄₂O₈, each substituted by one bezene and two cyclohexane ring and melting at ca. 133°C, have been characterised by X-ray crystal structure analyses and the relative configruations correlated with the large differences in stability constant with alkali-metal salts; one isomer forms a 1 : 1 methanol solvate.