Two molecules of diaza-12-crown-4 can be linked by two ethylene bridges between nitrogen atoms in two controlled steps, the last of which needs Li cation as a template, although Na cation is most strongly complexed by the tricyclic cryptand-like product.
M. J. Calverley and J. Dale, J. Chem. Soc., Chem. Commun., 1981, 1084 DOI: 10.1039/C39810001084
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