Preparation of macrocyclic polyether-thiono diester and -thiono tetraester ligands containing either the pyridine subcyclic unit or the oxalyl moiety, their complexes, and their reductive desulfurization to crown ethers
Preparation of macrocyclic polyether-thiono diester and -thiono tetraester ligands containing either the pyridine subcyclic unit or the oxalyl moiety, their complexes, and their reductive desulfurization to crown ethers