E. Graf et al., SYNTHESIS OF MACROCYCLIC DITOPIC RECEPTORS DESIGNED FOR SIMULTANEOUS BINDING OF ALKALINE AND TRANSITION-METAL CATIONS, Tetrahedron letters, 35(42), 1994, pp. 7779-7782
The synthesis of diazatetraoxacyclooctadecane derivatives bearing two
catechol groups was achieved in good yield. The binucleating ligands w
ere designed to bind both soft and hard cations simultaneously.